| A | B |
|---|
| solar energy | energy from the sun |
| rotation | one complete spin of the Earth on its axis |
| revolution | the Earth's trip around the sun |
| latitiude | the distance north or south of the equator |
| tropics | regions close to the equator |
| freshwater | water without salt |
| glaciers | large areas of slow-moving ice |
| precipitation | water that falls to Earth's surface as rain, snow, sleet, or hail |
| surface water | water that is found in Earth's streams, rivers, and lakes |
| groundwater | water found below the Earth's surface |
| water vapor | water in a gaseous state |
| water cycle | the movement of water from Earth's surface to the atmosphere and back |
| landforms | shapes on the Earth's surface |
| continents | large land masses |
| plate tectonics | suggests Earth's surface is divided into a dozen or so slow-moving plates |
| lava | magma tha reaches Earth's surface |
| earthquakes | sudden, violent movements or Earth's crust |
| weathering | process by which rock broken down into smaller pieces |
| erosion | movement of sediment from one location to another |
