| A | B |
|---|
| hydrosphere | an Earth systerm that includes all the water on the planet |
| atmosphere | the layer of gases that surrounds the Earth |
| surface water | water found on Earth's surface in places like oceans, lakes, rivers, and reservoirs |
| glacier | a huge mass of ice that forms on land when snow and ice accumulate faster than they melt |
| reservoir | a protected artificial or natural lake that is used to store wter |
| ground water | water that collects underground |
| water table | the upper level of water underground |
| water cycle | the process where water is recycled and reused |
| evaporation | the process by which a substance in its liquid form gains energy and enters its gaseous phase |
| water vapor | water in gas form |
| transipiration | the process by which plants lose water through tiny pores on their leaves |
| condensation | the process by which a substance in its gaseous phase loses energy and enters its liquid phase |
| precipitation | condensed water vapor falling back to earth in the form of rain, hail, sleet, snow, etc... |
| surface runoff | water that flows over land until it reaches lakes, rivers, oceans |
| percolation | the processof liquid moving through a porous substance |
| aquifer | an underground area of sediment and rocks that is filled with groundwater |
| watershed | an area of land that catches all precipitation and surface runoff and collects it in a body of water such as a river |
| Driving forces of the water cycle | sun, wind, storms, gravity, and people |
| Amount of Earth that is covered by water | 70% |
| Amount of water on Earth that is salt water found in oceans | 97% |
| Amount of fresh water available to humans, animals, and plants | 2% |
