| A | B |
|---|
| atmosphere | the thick layer of gases that surround the Earth |
| climate | the average weather over many years |
| mountain | a landform that is over 2,000 ft above sea level and has steep sides and a peak |
| plains | flat or gently rolling land |
| plates | pieces of the Earth's crust |
| rotation | one turn of the Earth around its axis |
| axis | the imaginary line that runs through the poles of the Earth around which the Earth rotates |
| hill | a landform that has less steep sides and is round on top |
| orbit | the path the Earth takes around the sun |
| plateau | a flat section of land that rises above the surrounding land and has at least one steep side |
| revolution | one full cycle of the Earth on its orbit around the sun |
| vegetation | plants |
| 24 hours (one day) | the amount of time it takes for the Earth to make one full rotation |
| 365 1/4 days (one year) | the amount of time it takes for the Earth to make one full revolution |
| high latitudes | the latitudes that receive no direct sunlight and are cold year round |
| middle latitudes | the latitudes that have seasons and receive some direct sunlight throughout the year |
| low latitudes | the latitudes that receive direct sunlight and are warm year round |
| wind and water | two items that are needed to control the Earth's climate |
