| A | B |
|---|
| groundwater | water filling spaces in underground rock layers |
| precipitation | snow, rain, sleet, hail |
| evaporation | liquid changing to gas |
| condensation | gas changing to liquid |
| tributary | streams that feed into a main river |
| wetland | area of land covered by shallow water at least part of the time |
| divide | separates 2 watersheds |
| watershed | land that supplies water to a river |
| reservoir | stores water for human use |
| irrigation | supplying water to land so crops can be grown |
| conservation | using less water so it won't be used up |
| pollution | adding things to water that have a negative effect on living things |
| pollutants | things that cause pollution |
| point source | specific source of pollution that can be identified |
| nonpoint source | source of pollution that cannot be identified |
| filtration | first step in treating drinking water |
| coagulation | adding alum to water to form flocs |
| aeration | forcing air through water to improve odor and smell |
| water cycle | continuous flow of water from Earth to the atmosphere and back again |
| habitat | place where an organism lives and obtains the things it needs to survive |
| permeable | characteristic of materials such as sand and gravel that allow water to move through easily |
| impermeable | characteristic of materials such as clay and granite that do not allow water to move through easily |
| saturated zone | area of permeable rocks or soil in which pores are completely filled with water |
| unsaturated zone | area above the water table; pores are filled with air and water |
| water table | top of the saturated zone; depth to the groundwater under Earth's surface |
| spring | place where groundwater bubbles or flows out of cracks in the rock |
| aquifer | underground layer of rock or sediment that holds water |
| artesian well | well in which water rises because of pressure within the aquifer |
| geyser | fountain of water and steam that builds up pressure underground and erupts at regular intervals |
| water quality | measurement of the substances in water besides water molecules |
| concentration | amount of one substance in a certain volume of another substance |
| pH | measurement of how acidic or basic the water is |
| hardness | level of calcium and magnesium in water |
| coliforn | bacteria are found in human and animal wastes |
