| Term | Definition |
|---|
| atmosphere | the blanket of gases that surrounds Earth |
| water vapor | a gas in Earth's atmosphere |
| ice cap | a thick sheet of ice covering a large area of land |
| soil water | water that soaks into the ground |
| groundwater | water stored in the cracks of underground rocks |
| evaporation | the process in which water particles change from a liquid to a gas |
| condensation | the process in which water particles change from a gas to a liquid |
| cloud | a mass of tiny droplets of condensed water in the atmosphere |
| precipitation | water in the atmosphere that falls to Earth as rain, snow, hail, or sleet |
| freeze | the process in which moving particles in water slow down, lose heat, and change from a liquid to a solid |
| melt | when water particles absorb heat energy and change from a solid to a liquid |
| water cycle | the continous movement of water between Earth's surface and the air, changing form liquid to gas to liquid |
| current | an ocean movement; a large stream of water that flows in the ocean |
| deep ocean current | a stream of water that flows more than 650 feet beneath the sea |
| surface current | the movement of the ocean caused by steady winds blowing over the ocean |
| tide | the rise and fall of ocean water levels |
| wave | an up-and-down movement of water |
| pore space | the space between soil particles |
| water table | the upper area of groundwater |
| runoff | the water that flows over Earth's surface but does not evaporate or soak into the ground |
| transpiration | a plant's release of excess water vapor through the stomata on the underside of its leaves |
| irrigation | a way to get water into the soil by artificial means |
| water treatment plant | a place where water is made clean and pure |
| filtration | the passing of a liquid through materials that remove impurities |
| sewage | water mixed with waste |
| sewer | a large pipe or channel that carriew sewage to a sewage treatment plant |
| septic tank | an underground tank in which sewage is broken down by bacteria |
| water conservation | the use of water-saving methods |
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