| Term | Definition |
|---|
| Aquifer | a layer of rock or sediment that can yield (provide) usable groundwater. |
| Cohesion | The attraction between water molecules, the force that helps allows water to form droplets. |
| Density | The amount of mass in a unit of volume. The density of pure water is 1.0 g/cm3 |
| Groundwater | Water that is held in underground layers of rock and sediment. Drinking wells deliver groundwater to the surface. |
| Irrigation | Piping water in from elsewhere and using it to grow crops. |
| Polar Molecule | a molecule with a slightly positive end and a slightly negative end. Polarity is caused when a molecule shares electrons unequally. |
| Soil Water | Water that is held within openings in the soil. |
| Specific Heat | The amount of energy that is needed to raise th temperature of 1 kg of a substance 1 degree Centigrade. The specific heat of water is very high. |
| Surface Water | Water at the Earth's surface. Lakes, rivers, ponds and streams are examples. |
| Water Conservation | The careful use and protection of water as a valuable resource. |
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