| A | B |
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| Orbit | The path followed by and object in space as it moves around another, such as that of Earth as it moves around the sun. |
| Revolution | One complete orbit of Earth around the sun; Earth completes one revolution every 365 days, one year. |
| Axis | An imaginary line around which a planet turns. |
| Rotation | The spinning motion of Earth, like a top on its axis |
| Land Form | An area of Earth's surface with a definite shape |
| Mountain | Usually, a landform that rises more than 2,000 ft above sea level and is wide at the bottom and narrow at the peak. |
| Hill | A landform that rises above the surrounding land and that has a rounded top |
| Plateau | A large, mostly flat area that rises above surround land |
| Plain | A large area or flat or gently rolling land usually without many trees. |
| Plate Tectonics | The theory that Earth's crust is made of huge, slowly moving slabs of rock called plates. |
| Plate | In geography, a huge section of Earth's crust |
| Weathering | The breaking down of rocks by wind, rain, or ice. |
| Erosion | A process by which water, wind or ice wears away landforms and carries that material to another place. |
| Atmosphere | The multilayered band of grass that surrounds Earth |
| Weather | The condition of the bottom layer of Earth's atmosphere in one place over a short period of time. |
| Temperature | The degree of hotness or coldness of something, such as water or air, usually measured with a thermometer. |
| Precipitation | All the forms of water, such as rain, sleet, hail, and snow, that falls to the ground from the atmosphere. |
| Climate | The weather patterms that an area typically experiences over a long period of time |
| Vegetation | The plants in an area |
| Canopy | A layer of branches and leaves at the tops of trees in a forest. |
| Tundra | A region where temperatures are always cool or cold and where only certain plants, such as low grasses, can grow. |
| Vertical Climate | The overall weather patterns of a region as influenced by elevation; higher the elevation, the colder the climate. |
