| Term | Definition |
|---|
| evaporation | the process by which water changes from liquid form to an atmospheric gas |
| condensation | the process of changing from a gaseous to a liquid or solid state |
| decomposition | (biology) decaying caused by bacterial or fungal action |
| combustion | a process in which a substance reacts with oxygen to give heat and light |
| precipitation | the falling to earth of any form of water (rain or snow or hail or sleet or mist) |
| runoff | water that flows over the ground surface rather than soaking into the ground |
| groundwater | water stored beneath the Earth's surface |
| water cycle | the continuous process by which water moves from Earth's surface to the atmosphere and back |
| transpiration | loss of water from a plant through its leaves |
| rain | drops of fresh water that fall as precipitation from clouds |
| sleet | partially melted snow (or a mixture of rain and snow) |
| hail | precipitation of ice pellets when there are strong rising air currents |
| snow | precipitation falling from clouds in the form of ice crystals |
| respiration | Using oxygen to turn food into energy. |
| nitrogen cycle | the cycle in which nitrogen gas is changed into forms of nitrogen that plants can use |
| nitrogen fixation | process in which bacteria convert nitrogen gas into nitrogen compounds plants can use to make food |
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