| A | B |
|---|
| conservation | the wise use of our natural resources |
| evaporation | process in which water from oceans, lakes, and streams is turned into gas or vapor |
| condensation | process in which water vapor changes into liquid form |
| precipitation | water that falls to the earth as rain, snow, or sleet |
| natural resource | anything from the natural environment that people use to meet their needs |
| renewable resource | resource that is easily replaced once they are used up |
| nonrenewable resource | metals and other minerals that connot be replaced once they are used up |
| pollution | putting impure or poisonous substances into land, water or air |
| acid rain | precipitation in which water carries large amounts of chemicals, especially sulfuric acid |
| environment | natural surroundings |
| watershed | area of land that drains into a body of water |
| aquifer | underground rock layer that stores large amounts of water |
| irrigation | artificial method of supplying water by methods such as pipes, canals |
| pesticides | chemicals used to kill insects and other plants |
| contaminate | to make unsafe for drinking |
| hazardous | dangerous or harmful |
| water sources | bodies of water such as lakes, rivers, reservoirs, and aquifers from which we get water |
| sustainable use | using resources in ways that do not deplete them |
| preservation | protecting resources, ecosystems and structures for present and future use |
| restoration | returning resources,ecosystems and stuctures to their original condition |
| water cycle | process by which the earth's water moves from oceans to air to land and back to oceans |
| ecosystem | community of plants and animals and their physical environment |
