arid: - a way of describing a climate that is dry and does not receive much rainfall

cardinal direction: - a term used to describe all four primary directions (north, south, east and west).

daylight saving: - a way states and countries change their clocks in spring and fall to make better use of daylight. It moves an extra hour of daylight to afternoon during March to October. This helps people who work outside. Daylight saving time also conserves energy, moving activities into the daylight so we do not need to use lights. Not all places participate in daylight saving time.

geology: - the study of the history of the planet Earth, its structure, and formation. Geologists study rocks and other materials that make up the planet Earth, both on the inside and on its surface.

Grand Canyon: - a canyon located in the state of Arizona. It is a steep-sided gorge carved by the Colorado River. Most of the Grand Canyon is located in the Grand Canyon National Park, one of the first national parks in the United States.

Navaho Nation: - the name given to the Native American people who inhabit large reservation lands in three US states: Utah, New Mexico, and Arizona. As a whole, the Navaho Nation is the most populous contemporary Native American groups in the United States. They are noted as skilled potters, weavers, and silversmiths.

political map: - map that shows the governmental boundaries between states, provinces, countries, and other man-made divisions. Political maps often include locations of major cities (another man-made government), and typically large bodies of water.

scale: - shows the relationship between the distance on a map and the corresponding distance on the earth. For example, 1 inch may equal 500 miles. This allows users to calculate the approximate distance between two locations on a map.

temperate: - a climate that provides warm summers and mild winters. The temperatures do not typically get extremely hot or cold.

valley: - lowland between mountains or hills