| A | B |
|---|
| water vapor | invisible gases from water, water in the form of invisible gas |
| water cycle | continuous movement of water on, above, and below the surface of the earth also know as the hydrologic cycle |
| condensation | process in which water vapor cools into a liquid |
| precipitation | process in which water becomes too heavy in the clouds and falls back to earth as rain snow, sleet, hail, fog, mist or dew |
| percolation | the downward movement of water through pores and other spaces in soil due to gravity |
| photosynthesis | process in which plants convert solar energy into sugar for fuel |
| runoff | excess water on earth's surface which flows over land |
| sun | star; the center of the solar system - provides the energy which powers the water cycle; energy produced by nuclear fusion |
| transpiration | process in which water from leaves and stems of plants escapes into the atmosphere as water vapor |
| collection | process in which water falls back to earth in areas such as lakes, rivers, ponds, oceans and groundwater |
| irrigation | the artificial application of water to land to assist in the production of crops |
| reservoir | natural or artificial lake or area used to store a large amount of water used by peoople |
| desalination | a process of removing salt from ocean water |
| groundwater | water located beneath the earth's surface in pores and spaces between rocks |
| zone of aeration | rainwater passes through upper zone |
| zone of saturation | area where water collects and the spaces between the rock particles is filled with water |
| aquifer | a rock layer that stores groundwater and allows the flow of groundwater |
| water table | when the zone of aeration and the zone of saturation meet at a boundary |
| porosity | the percentage of open space between individual rock particles in a rock layer |
| permeability | a rock's ability to let water pass through |
| impermeable | a rock that stops the flow of water |
| friction | a force that causes moving objects to slow down |
| recharge | an area in which water travels downward to become part of an aquifer |
| spring | when a water table reaches the earth's surface, water flows out from the ground and will form a spring |
| cap rock | the top layer of impermable rock |
| artesian spring | a spring where water flows from a crack in the cap rock of the aquifer |
| well | a human made hole that is deeper than the water table |
| evaporation | process in which a liquid gains enough energy to change into a gas |
