| A | B |
|---|
| fresh water | 2 atoms of hydrogen and 1 atom of oxygen |
| precipitation | solid or liquid water that falls from the air to the Earth |
| condensation | the change of state from a gas to a liquid |
| evaporation | the change of state from a liquid to a gas |
| percolation | when water filters through land |
| infiltration | passing through or filtering through another object |
| runoff | rainwater that does not sink into the ground but drains into a body of water |
| tributary | a smaller stream or river that flows into a larger one |
| drainage basin | the land drained by a river system, which icludes the main river and all its tributaries |
| watershed | the land drained by a river system, which includes the main river and all of its tributaries |
| divide | an area of higher ground that separates drainage basins |
| channel | a path a stream follows |
| gradient | a measure of the change in elevation over a certain distance |
| load | the materials carried in a stream's water |
| deposition | the process by which material is dropped or settles |
| alluvium | rock and soil deposited by streams |
| delta | a fan-shaped deposit of alluvium at the mouth of a stream, where the stream empties into a larrge body of water |
| flood plain | an area along a river fromed from sediments deposited by floods |
| ground water | water that is located within rocks below EArth's surface |
| water table | an underground boundary where the zone of aeration and the zone of saturation meet |
| aquifer | a rock layer that stores and allows the flow of ground water |
| porous | having open spaces between individual rock particles |
| permeable | able to let water pass through it |
| artesian springs | a spring that forms where cracks occur naturally in the cap rock and the pressurized water in the aquifer flows through the cracks to the surface |
| erosion | the removal and transport of material by wind, water or ice |
| salinity | a measure of the amount of dissolved salts and other solids in a given amount of liquid |
| desalination | the process of evaporating sea water so that the water and the salt separate |
| tide | daily movement of ocean water that change the level of the ocean's surface |
| current | a stream-like movement of ocean water |
| upwelling | a process in which cold, nutrient-rich water from the deep ocean rises to the surface and replaces warm surface water |
| wave | movement that carries energy through water |
| storm surge | a local rise in sea level near the shore that is caused by strong winds from a storm |
| tsunami | a wave that forms when a large volume of ocean water is suddenly moved up or down |
| swells | rolling waves that move in a steady procession across the ocean |
| nonpoint source pollution | pollution that comes from many sources and that cannot be traced to specific sites |
