| Term | Definition |
|---|
| groundwater | water that is underground |
| surface water | water that is on the earth's surface |
| water table | the top layer of the water level |
| aquifer | underground layer of rock that holds water |
| permeable | allows water to pass through |
| impermeable | does not let water pass through |
| porous | material that has many spaces, holes |
| nonporous | material that has few or no spaces or holes |
| saturated zone | the area where water fills all the openings in the underground soil or rock, this includes many water filled crevices in the upper layer of bedrock |
| unsaturated zone | the zone usually present between the water table and surface where openings in the soil are inly parcially filled wuth water, this area can not provide water for wells |
| recharge zone | area of land where new water enters an aquifer |
| watershed | the area of land in which runoff drains into a river (underground and above) |
| runoff | after precipitation, it is water that runs off the surface of the land into lakes and oceans |
| percolation | movement and filtering of water through porous materials |
| accumulation | process of growing into a large amount (water that puddles up, lakes, rivers, oceans) |
| well | a hole drilled or bored into the earth to obtain water |
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