| A | B |
|---|
| abyssal plain | flat ocean bottom, flattest place on Earth |
| alluvial fan | fan shaped mass of material deposited by stream |
| aquifer | body of rock or sediment that stores ground water and allows it to flow |
| channel | path a stream follows |
| condensation | gas to a liquid |
| delta | fan shaped mass of material deposited at mouth of stream |
| deposition | process in which material is laid down |
| evaporation | liquid to a gas, most occurs over oceans |
| floodplain | area along river that forms from sediments deposited when river overflows |
| groundwater | precipitation that seeps into ground and collects |
| nonpoint source pollution | pollution comes from many sources no single specific site |
| percolation | movement of water through soil |
| permeability | ability of rock or sediment to let fluids pass through its open spaces |
| pointsource pollution | pollution from a specific site |
| porosity | percentage of total volume of rock that has open spaces for fluids to pass through |
| precipitation | rain, sleet, hail, and snow |
| recharge zone | ground surface where water enters aquifer |
| runoff | drainage of water on the ground |
| salinity | measure of the amount of dissoved salts in a liquid |
| transpiration | evaporation of water from trees and plants |
| water cycle | continuous movement of water from ocean to atmosphere to land and back to ocean |
| water table | upper surface of underground water, upper boundary of zone of saturation |
| water vapor | particles of water in the air in the form of gas |
| watershed | area of land that is drained by a water system |
