| A | B |
|---|
| continental shelf | plateau off of a continent that lies under the ocean and stretches for several miles |
| trench | deep cut in the ocean floor |
| groundwater | water that filters through the soil into the ground |
| aquifer | underground layer of rock through which water flows |
| water cycle | system in which water moves from the earth to the air and back to the earth |
| evaporation | part of the water cycle; process by which water changes from liquid to gas |
| condensation | part of the water cycle; process by which water changes from gas to liquid |
| precipitation | part of the water cycle; process by which water falls to earth as, for example, rain or snow |
| collection | part of the water cycle; process by which streams and rivers carry water that has fallen to earth back to the oceans |
