| A | B |
|---|
| water vapor | the invisible, gaseous form of water |
| evaporation | when a liquid is changed to a gaseous state |
| traspiration | the process by which plants release water vapor through their leaves |
| precipitation | forms of water such as rain, sleet, snow, or hail that fall from clouds to Earth's surface |
| condensation | the process by which a gas changes to a liquid |
| irrigation | the process of supplying water to areas of land to make them suitable for growing crops |
| pores | tiny openings in and between particles of rock and soil |
| permeable | materials that allow water to pass easily through them |
| impermeable | materials through which water does not pass easily through |
| water table | the top of the saturated zone |
| saturated zone | a layer of permeable rock or soil in which the cracks and pores are completely filled with water |
| unsaturated zone | a layer of rocks and soil above the water table in which the pores contain air as well as water |
| aquifer | an underground layer of rock or soil that holds water |
| spring | a place where groundwater bubbles or flows out of cracks in the rocks |
| artesian well | a well in which water rises because of pressure within the aquifer |
| pH scale | how acidic or basic a substance is; scale of 1-14 |
| hardness | the level of minerals calcium and magnesium in water |
| concentration | the amount of one substance in a certain volume of another substance |
