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Saving electricity - Michael Bluejay

Grades
7 to 12
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Learn the basics of electricity: the meaning of kilowatt hour, reading bills, and identifying how different appliances use electricity. Students can browse a wealth of resources written...more
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Learn the basics of electricity: the meaning of kilowatt hour, reading bills, and identifying how different appliances use electricity. Students can browse a wealth of resources written in easy-to-understand terms on energy saving devices, carbon footprints, and alternate forms of energy.

tag(s): climate (92), climate change (64), conservation (127), electricity (88), energy (198)

In the Classroom

Students can work in groups to research various issues regarding electricity use. Students can create powerpoints, multimedia presentations, or wiki pages to demonstrate what they have learned. Have your students present to members of the class and follow up with a town hall debate concerning household, local, and other decisions concerning electricity use and production.

Have students learn to read their electricity bill and create an action plan to save electricity. Have students journal or blog the changes that were made and the savings in money and pollution. Identify energy wasters at school and formulate a plan to save money and resources. an to save money and resources.

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Project Vulcan - Purdue University

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9 to 12
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This site shows carbon dioxide emissions across the U.S. One graph shows the differences in CO2 emissions in different seasons. Another has a list and graph of the top emitting ...more
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This site shows carbon dioxide emissions across the U.S. One graph shows the differences in CO2 emissions in different seasons. Another has a list and graph of the top emitting counties across the U.S. A YouTube video liked from the site explains the project, discusses its parameters and results, and displays maps of the U.S. which show different types of noxious sources on a very close-up scale. Vulcan project scientists plan to do similar mapping for Mexico and Canada. This site requires Flash. You can get it from the TeachersFirst Toolbox page.

tag(s): charts and graphs (195), pollution (66)

In the Classroom

Use the video and data graphics when studying the effect of man-made energy burners on the ecosystem. Share the video on a projector or interactive whiteboard. Also, students studying different types of non-static graphs can analyze the different displays of the effects of CO2 on the atmosphere and weather.
 This resource requires PDF reader software like Adobe Acrobat.

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StarDate Online - McDonald Observatory

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K to 12
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Use this comprehensive site to learn about the planets of the solar system as well as other objects. Use the "Stargazing" tab to view "Weekly Tips," "Sky Almanac," "Constellation Guide,"...more
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Use this comprehensive site to learn about the planets of the solar system as well as other objects. Use the "Stargazing" tab to view "Weekly Tips," "Sky Almanac," "Constellation Guide," "Moon Phases," "Beginner's Guide," and more. Under the "Teacher's" tab use resources such as "Lesson Plans," "Classroom Activities," "StarDate in the Classroom," or "Teacher Workshops." Materials in the teacher section provide activity directions, materials needed, as well. as documents in Adobe pdf format. There are lessons from K-12. In the "Resources" section, you will find a wealth of information and pictures about the Sun, inner planets, outer planets, and minor bodies. View past and future planned space missions. Links to keywords allow for a greater understanding of the material. Activities in the "Resources" section are listed along the side with appropriate ages. Ask Merlin provides questions and their answers. A tab to the "Gift Shop" is available, so students should be cautioned. Some of the classroom activities require Adobe Reader. Get it from the TeachersFirst Toolbox page.

tag(s): planets (123), solar system (119), space (205)

In the Classroom

Use the activities in the Teacher's resource section to provide background material for understanding Astronomy. Many activities may already be known to the teacher, but these are thoroughly explained. Students could even teach the concepts to their classmates and use these activities as a demonstration.
 This resource requires PDF reader software like Adobe Acrobat.

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Hurricane Hunters Association - Hurricane Hunter Association

Grades
4 to 12
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Hurricane Hunters is a resource to find photos and data from past hurricanes. Hurricanes and data are archived by year. Find photos from above a hurricane with logs and information...more
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Hurricane Hunters is a resource to find photos and data from past hurricanes. Hurricanes and data are archived by year. Find photos from above a hurricane with logs and information from the planes that follow the storms. Research more information about science and meteorology by using the multitude of links provided. Real time data of current storm conditions in the world are available on the website. View spectacular photos in the "Photos" section or click on "Questions" to read the most often asked questions and their answers. In the "Questions" is a link to a cyberflight that walks through the before, during, and after of a Hurricane Hunter flight. This site is mostly text and pictures.

A link to a "Hurricane Hunters Gift shop" is found on the main page and students should be advised to avoid such an advertisement. The site requires Flash for storm updates. Get it from the TeachersFirst Toolbox page.

tag(s): hurricanes (35), weather (188)

In the Classroom

Compare numbers of hurricanes of various years. Plot locations, and storm paths on the same chart (or in Google Earth) to determine the origination point and landfall or end point of the hurricanes to draw conclusions. Use the information to determine the physical characteristics of the hurricanes (instead of looking them up in an encyclopedia). Determine the areas of the world where hurricanes occur in order to understand factors responsible for hurricane formation. Have students track a current hurricane and use information learned on this site to predict the spot where it will make landfall and provide reasoning for their choice.
 This resource requires Adobe Flash.

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National Renewable Energy Laboratory - US Department of Energy

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9 to 12
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Learn about alternative technologies such as "Advanced Vehicles and Fuels," Basic Sciences," "Biomass," "Buildings," "Energy Analysis," "Geothermal," "Hydrogen and Fuel Cells," "Solar,"...more
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Learn about alternative technologies such as "Advanced Vehicles and Fuels," Basic Sciences," "Biomass," "Buildings," "Energy Analysis," "Geothermal," "Hydrogen and Fuel Cells," "Solar," and "Wind." Use the site for some great background information on alternative technologies as well as links to other information. View publications in Adobe pdf that can be downloaded for additional information. Adobe Acrobat is available at the TeachersFirst Toolbox page.

tag(s): ecology (135), energy (198), environment (317)

In the Classroom

Divide the class into groups to read and decide information that should be presented in class. Use the information to make recommendations to their families, school district, or the community for future energy change. Use these discussions to determine how they can best meet energy needs of the future. In government class, ask student groups to prepare a policy statement on energy for a hypothetical political candidate.
 This resource requires PDF reader software like Adobe Acrobat.

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Extreme Weather Sourcebook - National Center for Atmospheric Research

Grades
7 to 12
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How many severe weather events occurred in 2001? How much did the damage and clean up cost? Use this site to obtain monetary damages and numbers of events for "Hurricanes," ...more
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How many severe weather events occurred in 2001? How much did the damage and clean up cost? Use this site to obtain monetary damages and numbers of events for "Hurricanes," "Floods," Tornadoes," "Lightning," and "others." Data is given both in table and chart form and is sorted by state.

tag(s): climate (92), disasters (39), natural disasters (20), weather (188)

In the Classroom

Use the data to determine where most severe weather events occur and to determine why they occur in those areas. Research the science behind the events and reasons for the devastation. Have students create an action plan in the event of severe weather or identify ways to lessen devastating effects of some of the events. Students can also research recent year's data and make comparisons of the numbers.

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The Nine Planets - William A. Arnett

Grades
4 to 12
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Here's a planet-by-planet introduction to the solar system which features stunning photographs and supporting content. If you are thinking that there are eight planets and not nine,...more
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Here's a planet-by-planet introduction to the solar system which features stunning photographs and supporting content. If you are thinking that there are eight planets and not nine, you are right, and the website points out that fact. This continually-updated site has much of the latest research on all planets, moons, and other bodies in our solar system. This site goes beyond the pictures that are courtesy of NASA as well as the information learned from countless missions. The site also provides insight into how to view planets with binoculars and other materials as well as information on mythology and history. View the movies provided and listen to the recorded sounds. Gain a renewed appreciation of the solar system using this informative site. This site does include some advertising. But it is not distracting from the great content.
This site includes advertising.

tag(s): moon (72), planets (123), solar system (119)

In the Classroom

Want to find updated information about the objects in the solar system? Have your students use this site. Divide your students into groups and have them report on a particular object in the solar system. Have them present a report on one of the 8 planets, as though teaching their peers. Have students create a multimedia presentation using UtellStory, reviewed here. This site allows users to narrate a picture. Challenge students to find a photo (legally permitted to be reproduced), and then narrate the photo as if it is a news report. To find Creative Commons images for student projects (with credit, of course), try PhotoPin, reviewed here.Consider making a class wiki about the solar system and including drawings or photos your students might create from their observations.
 This resource requires Adobe Flash.

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Mars Today - Spaceref Interactive

Grades
6 to 12
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The Mars Rover is providing information continually. Use this site to keep track of recent findings, developments, and understandings from the Mars Rover. This site appears as a series...more
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The Mars Rover is providing information continually. Use this site to keep track of recent findings, developments, and understandings from the Mars Rover. This site appears as a series of news articles listed in reverse chronological order along with their abstracts. Click on each newsworthy item to learn more information. Additional links are provided in each article. A Spaceref directory can be found that links to additional Mars related topics on the Spacref.com website. There are some advertisements at this website.

tag(s): mars (41), planets (123), solar system (119)

In the Classroom

Students can use this site to challenge previous information or myths with new findings. Have students create a timeline showing the launch, travel, landing, and findings from the Mars rover mission.

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Earthquake - Virtual courseware for Earth and Environmental Sciences

Grades
6 to 12
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This site is an interactive computer program designed to introduce the concepts of how an earthquake epicenter is located and how the Richter magnitude of an earthquake is determined....more
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This site is an interactive computer program designed to introduce the concepts of how an earthquake epicenter is located and how the Richter magnitude of an earthquake is determined. Choose "Demonstration" for background information. View the demonstrations of "Travel Time" and "Epi and Mag" to learn more about earthquakes and how to use the tools. By using the demonstrations, students create data that is graphed and can be analyzed. Problems are presented to the students to determine the epicenter of a specific event. If you wish to not use the demonstration, click on the animations to learn about "SP lag time" and "Latitude and Longitude." Instructors can also register for free on the site and students can take an exam when completed with the activity. Exams will be graded and results reported to the teacher. Click "Instructions" to walk through the registration and use. This site requires Java and Flash. Click the "System Requirements" button to test these programs on your computer before proceeding. If you need Java or Flash, you can get it from the TeachersFirst Toolbox page. NOTE: the site opens slowly. Please be patient, and be sure to check the technical requirements.

tag(s): earth (228), earthquakes (48), geology (81), weather (188)

In the Classroom

Use the data to determine epicenter as well as the magnitude of an event. Use data from other sources to determine the same. Use this demo on your interactive whiteboard or projector after discussing specific information about earthquakes and part of a final project. Use the simulations to learn more about how scientists determine where earthquakes start.
 This resource requires Adobe Flash.

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Understanding Earthquakes - University of California Santa Barbara

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3 to 12
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Want to find more information about Earthquakes? Use the Understanding Earthquakes site to take a small "Quiz," use the rotating "Globe" to view earthquake locations, and read...more
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Want to find more information about Earthquakes? Use the Understanding Earthquakes site to take a small "Quiz," use the rotating "Globe" to view earthquake locations, and read of first hand "Accounts" from a person's perspective. View how earthquakes occur by clicking on "Rebound," or the "History" of past earthquakes since 1910, as well as other informational sites linked in "Others." Site requires Java and Flash. You can get both from the TeachersFirst Toolbox page.

tag(s): earth (228), earthquakes (48), weather (188)

In the Classroom

Use the information as an introductory activity to disasters. Use the data to identify common places where earthquakes occur, research the different types of faults, provide information of the various earthquakes and locations affected, or as a springboard for individual or class projects. Note that much of the information is text-heavy, so younger readers will need assistance reading.
 This resource requires Adobe Flash.

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Dive and Discover - Woods Hole Oceanographic Association

Grades
4 to 12
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What do we see and what can we learn from the Sea floor? Use the Interactive map or the drop down along the top to access past expeditions to the ...more
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What do we see and what can we learn from the Sea floor? Use the Interactive map or the drop down along the top to access past expeditions to the sea floor. Click on the "Dive Into Deeper Discovery" tab to learn more about Deep Ocean Circulation, History of the Earth, Ice Ages, Ships and Technology, among others. Click the "For Teachers" tab to access and view classroom activities to use. The site is updated daily with photos, videos, and research. This site requires Flash. You can get it from the TeachersFirst Toolbox page.

In the Classroom

Use a single activity, have students collect information as homework, or a class project. Use these activities as an introduction to a science lesson or for application for information learned in class. Some activities have a hands-on component. Create a timeline of information, technology, or history from the dives. Have students use the scientific method to analyze work completed during the dives. Research background science and engineering topics for better understanding of information learned during the explorations. Topics for reports can be found throughout the information. The class can be divided into groups to report on specific aspects of the dive and their information can be reported to the class with the additional background information. Students can keep a journal of information learned and create a poster or model of the information.
 This resource requires Adobe Flash.

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Greenraising: Eco-friendly Fundraising - Greenraising

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K to 12
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Why raise funds on items that cause the Earth to frown? Your school fundraising becomes 'green' when you register at this site and start earning funds from eco-conscience shoppers....more
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Why raise funds on items that cause the Earth to frown? Your school fundraising becomes 'green' when you register at this site and start earning funds from eco-conscience shoppers. Your school earns 25% to 40% of all internet or catalog driven sales. (Read the site for details.) Greenraising supplies you with order forms and catalogs if you care to do a catalog drive. It sounds easy, and it definitely is green. TeachersFirst does not ordinarily mention fundraising sites, but the possibilities for a school service project looked interesting enough to list this one.

tag(s): earth (228), earth day (112), ecology (135), environment (317)

In the Classroom

This fundraising organization may be a prudent way to fund your school's wildlife or biology club. Why not kick-off this event near Earth Day? Also, teachers, you can coordinate your recycling and earth-loving lessons around this fundraiser.

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Sea Monsters Virtual Dig - National Geographic

Grades
3 to 12
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Students are always fascinated and intrigued about animals that are extinct. Follow the actual work of paleontologists in this interactive site. Choose a fossil dig site to start from...more
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Students are always fascinated and intrigued about animals that are extinct. Follow the actual work of paleontologists in this interactive site. Choose a fossil dig site to start from "Giant fish's last meal," "Deadly dinosaur duel," or "Dinosaur nest." Read introductions and background information about paleontology. Use the basic tools of paleontology to uncover fossil remains. Move the tools (hammer, pick, and brush) to areas you wish to use them. After clearing enough of the structures, the fossil will automatically be revealed. Move on to the view the steps for the preparation of the shipment of the fossil and the reporting of the findings .

Follow the links along the top to resources and lesson plans for all levels in pdf documents, pictures, movie trailers, and an interactive time line. This site requires Flash and Adobe Acrobat. Get both from the TeachersFirst Toolbox page.

tag(s): fossils (44), paleontology (41)

In the Classroom

Use this site to share information about fossil digs. Students can fit these animals into time lines of other animals discussed in class. Use during a unit about ecosystems and food chains as well as how the remains of fossils have become the fuels of today.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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Map Collections Home Page - Library of Congress

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6 to 12
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The Library of Congress offers this searchable database of historical maps, which includes a large collection of city maps, maps of military battles and campaigns, maps related to transportation...more
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The Library of Congress offers this searchable database of historical maps, which includes a large collection of city maps, maps of military battles and campaigns, maps related to transportation and communication, and maps focused on exploration and discovery. Within each category, you can search geographically or by time period. Each map accessed can be navigated using a zoom feature for better viewing. Maps cover a wide range of national and international subjects.

tag(s): battles (16), environment (317), maps (287), transportation (40)

In the Classroom

Teachers with interactive whiteboards or projectors will find these maps a natural companion to lessons involving history, geography, and cultural changes. Sometimes seeing a map drawn at the same time as the event under discussion can lend a whole new understanding of the culture of the people being studied. It's far more dramatic to imagine sailing into the unknown on a voyage of discovery while you look at the only maps available to those aboard.

Be sure to have students use the whiteboard tools to draw in their own "corrections" or annotations showing the movement of people or strategies used in battles. Since thee resources are in the public domain, you are allowed to copy them into your whiteboard software and keep the student annotations atop the maps, as well. The maps also make good visuals for "mock" blog entries by historical figures!

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Showing Evidence: Analyzing and Evaluating Information - Intel Education

Grades
3 to 12
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Give your students the skills to analyze and evaluate information with Intel's free "Showing Evidence tool." "Showing Evidence" provides a visual framework to help students learn how...more
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Give your students the skills to analyze and evaluate information with Intel's free "Showing Evidence tool." "Showing Evidence" provides a visual framework to help students learn how to construct well-reasoned arguments and prove their case with credible evidence. Students are prompted to consider the quality of the evidence and the strength of the evidence to support their claim. When an argument is complicated, the components of the tool help students think through justifying a claim.

This web-based tool is accompanied by detailed lesson plans designed for elementary, middle, and high school students. A variety of subject areas and projects are ready to adapt for the classroom or implement as-is. Explore the project ideas, instructional strategies, assessment tips, and research to help you plan a project of your own. Registration is free and creates a teacher workspace in which to build the class project. The password-protected workspace is accessed through the internet where students log on with the teacher-created ID, team ID, and password. Students can access the project workspace from home or though other Internet access points such as the public library.

Be sure to disable your popup blocker, as the site needs to show popup windows during the project. This site requires Flash and Adobe Acrobat Reader. Get these tools from the TeachersFirst Toolbox page..

tag(s): debate (41), folktales (65), shakespeare (131), thinking skills (17)

In the Classroom

Teachers can use the comprehensive tutorial to learn the features of the tool and use the workspace to practice with the tool. Take advantage of the detailed unit plans that provide usable handouts and student work samples. Or just browse through several shorter project descriptions for project ideas that suit your classroom.

Make a shortcut to this site on your desktop and student computer desktops for easy access. Use the "Showing Evidence "tool to explore themes such as why do we explore, what happens next, is everything we read true, and what is freedom? Have student teams stage debates using their visual diagrams to show their thinking processes to the class using an interactive whiteboard or projector.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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Fossil Mysteries - San Diego National History Museum

Grades
2 to 10
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Learn all about fossils and paleontology. For the online information and interactives, choose "Activities Online" from the left side navigation menu. Choose "Who moved the Body" to...more
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Learn all about fossils and paleontology. For the online information and interactives, choose "Activities Online" from the left side navigation menu. Choose "Who moved the Body" to learn how dinosaur fossils are made and unearthed. Click on "What Am I" to learn how paleontologists determine the names of the bones and the dinosaur identified from a fossil. The "Fossil Field Guide" provides extensive information about many extinct animals, their ecology, characteristics, and where they used to live. The "Geologic Time line" on the right side allows you to explore the different geologic time periods and the organisms that would be found there. "Educational Resources" can be used to visit "Dinosaur Dig," to view frequently asked questions, play "Jurassic Jumble" for interactive puzzles (requires Java), view a slide show, or "Name that Reptile." The educational resources contain a large and varied amount of information that includes many other titles such as "The Science of Jurassic Park." ." Younger readers will need help with many of the text passages. Several printable resources are available and require Adobe PDF. This site requires Flash and Adobe Acrobat. You can get it from the TeachersFirst Toolbox page..

tag(s): dinosaurs (57), geology (81), paleontology (41)

In the Classroom

Students can use the information in the Fossil Field Guide to create dioramas, posters, or digital media by using Make Beliefs Comics to create a fictional story of the extinct animal. Students can also use this information to show adaptations of organisms or similarities and differences between them. The information can also be used to identify structures that are also present in today's animal kingdom. Create a class time line that stretches the room and plots the animals that were present during each time period.
  This resource requires Adobe Flash and PDF reader software like Adobe Acrobat.

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The Ozone Resource page - National Aeronautics and Space Administration

Grades
8 to 12
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Use this site to understand the ozone and how it affects our air quality and life here on Earth. Satellite imagery of ozone holes includes an updated daily picture and ...more
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Use this site to understand the ozone and how it affects our air quality and life here on Earth. Satellite imagery of ozone holes includes an updated daily picture and comparison over the last decades. NASA facts listed on the side include an opportunity to learn more about the information presented, watch satellite images from the last 7 days, view animations, compare year-to-date, and look at the annual records since 1979 using "Ozone Hole Watch." Information about the ozone and how it is measured is explained in detail here. "Explore the ozone with NASA" by viewing a short video that outlines the ozone and discusses new research and climate change. Use the "Resources for News Media" to view the Multimedia gallery for pictures of the largest ozone hole on record, the Arctic vortex, and Earth's Atmospheric Layers. Information about ozone depleting chemicals and ozone chemistry is also found here. View video of the ozone missions from NASA. "Ozone Hole 101" provides basic content about the ozone that is easy to understand for students. Read interesting information such as "Ozone levels drop when hurricanes are strengthening" and "Ozone hole is a double record breaker." This site requires Quicktime and animations require Flash. You can get both from the TeachersFirst Toolbox page.

tag(s): earth (228), earth day (112), environment (317), ozone (10)

In the Classroom

Students can use the resources in "Ozone Hole Watch" to determine the trends in the ozone either daily or over the years. Further research involving political, consumer, and environmental trends can bring insights into effects on the ozone layer. Using the wealth of material on the site, students can use the information to create a "Handbook of the Earth" (as an example) to understand how the ozone affects us in our current and future lives. Students can also work in groups and be assigned portions of the content to study. They can then present their findings to the rest of the class (using a multi-media presentation). Students can use this information in conjunction with environmental or Earth Day activities in or out of class.
 This resource requires Adobe Flash.

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Footprints Science - Footprints Science

Grades
4 to 12
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Footprints Science consists of simulations and interactives on many key concepts that are difficult to visualize and understand in Science. The site offers purchase of different modules...more
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Footprints Science consists of simulations and interactives on many key concepts that are difficult to visualize and understand in Science. The site offers purchase of different modules or the complete collection. Samples, however, are free to use. Biology samples include "DNA drag and drop," "Kidney animation," "Fertilisation animation," and "Breathing animation." Chemistry samples include "Periodic Table interactive activity," "States of matter animation," and "Atomic structure activity."Physics samples include "Forces animation," "Power Station animation," and "Phases of Moon animation." Coursework includes "Variables," "Planning," "Graph," and "Line of best fit." More animations and interactives for each subject are available. The items are designed to be used with instruction to make the concepts more engaging. Interactives use drag and drop labeling with immediate feedback and allow pausing to stop the animation. Quizzes and games are also available. Graphics are very well done and easy to see, making difficult concepts much easier to understand. Interactives can be viewed as a large screen. This site requires Flash. You can get it from the TeachersFirst Toolbox page..

tag(s): charts and graphs (195), dna (69), forces (45), matter (58), moon (72), periodic table (50), variables (22)

In the Classroom

The resource is an exciting add-on to teacher lessons and exceptional when used on an interactive whiteboard or projector. The samples can be used as a pre-lesson for students to obtain the general gist of the concept and brainstorm key points that they recognize from the simulation or interactive. Teachers can then use the student insights to discuss the content being presented and piece together the information. Teachers can also use the samples after original discussion of the content to reinforce material that students should learn and offer a visual representation of the topic. The simulation can also be used as reinforcement. Students can watch the simulation and then "explain the experiment" by putting the concept into their own words to demonstrate understanding.
 This resource requires Adobe Flash.

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Volcanoes: Can We Predict Volcanic Eruptions - Annenberg Media

Grades
8 to 12
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This website highlights the many active volcanoes worldwide and answers the question, "Can we predict volcanic eruptions?" The highlight of this website is the "case files" students...more
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This website highlights the many active volcanoes worldwide and answers the question, "Can we predict volcanic eruptions?" The highlight of this website is the "case files" students read through to predict an eruption. Other topics include Melting Rocks, Dynamic Earth, Judging Hazards, Forecasting, & Coping With Risk . One of the video clips requires QuickTime, some of the interactive activities also require FLASH. Get both from the TeachersFirst Toolbox page..

tag(s): plate tectonics (23)

In the Classroom

Use your interactive whiteboard (or projector) to take your students on this volcanic adventure. Have your students take on the role of "weather chasers." Study the case files together, read about the warning signs, and see if your students can "track the volcano."
 This resource requires Adobe Flash.

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Guns Germs, & Steel - PBS

Grades
9 to 12
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Jared Diamond's book Guns Germs & Steel won a Pulitzer Prize for non-fiction. This website presents an overview of some of the major threads of Diamond's thesis as ...more
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Jared Diamond's book Guns Germs & Steel won a Pulitzer Prize for non-fiction. This website presents an overview of some of the major threads of Diamond's thesis as presented in the PBS special based upon the book. Diamond suggests that geography may have been the single most important factor in the rise and fall of civilizations over the course of human history. The site examines some of the variables that have contributed to the success or failure of societies through history, including crops, animals, technology, and climate. There are lesson plans tied to national standards associated with each of the televised episodes. While viewing the series is an option, much can be gained by examining the lesson plans even without watching the series.

tag(s): cultures (105)

In the Classroom

The information contained here will be most helpful in planning lessons on the interdependence of culture, geography and technology. Students may find information here for research purposes, but this site should be considered mostly for its usefulness to teachers in advance of unit planning.

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