| A | B |
|---|
| aquifer | layer of permeable rock that allows water to flow through |
| beach | deposit of sediment whose materials vary in size, color, and composition and is most commonly found on a smooth, gently sloped shoreline |
| cave | underground opening that can form when acidic groundwater dissolves limestone |
| channel | groove created by water moving down the same path |
| drainage basin | land area from which a river or stream collects runoff |
| geyser | hot spring that erupts periodically and shoots water and steam into the air - for example, Old Faithful in Yellowstone National Park |
| groundwater | water that soaks into the ground and collects in pores and empty spaces and is an important source of drinking water |
| impermeable | describes materials that water cannot pass through |
| longshore current | current that runs parallel to the shoreline, is caused by waves colliding with the shore at slight angles, and moves tons of loose sediment |
| meander | broad, c-shaped curve in a river or stream, formed by erosion of its outer bank |
| permeable | describes soil and rock with connecting pores through wich water can flow |
| runoff | any rainwater that does not soak into the ground or evaporate but flows over Earth's surface |
| sheet erosion | a type of erosion caused by runoff that occurs when water flowing as sheets picks up sediments and carries them away |
| spring | forms when the water table meets Earth's surface; often found on hillsides and used as a fresh-water source |
| water table | upper surface of the zone of saturation; drops during a drought |
