| A | B |
|---|
| solar energy | energy from the sun |
| rotation | one complete spin of Earth on its axis |
| revolution | one trip of Earth around the sun |
| latitude | the distance north or south of Earth's equator |
| tropics | regions close to the equator |
| freshwater | water without salt |
| glacier | large area of slow-moving ice |
| precipitation | water that falls to Earth's surface as rain, snow, sleet, or hail |
| water vapor | water that occurs in the air as an invisible gas |
| water cycle | the circulation of water from Earth's surface to the atmosphere and back |
| landforms | shapes on Earth's surface, such as hills or mountains |
| continents | large landmasses |
| erosion | the movement of sediment from one location to another |
