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| Term | Definition |
|---|---|
| evaporation | process whereby the heat of the sun changes water on Earth's surface from a liquid to a gas |
| condensation | return of water vapor into a liquid by cooling |
| precipitation | liquid or soil water that falls from clouds to Earth |
| transpiration | release of water vapor from plants' leaves into the air |
| runoff | precipitation (water) that runs off the land |
| groundwater | water stored beneath the Earth’s surface in rock |
| source | place where a stream or river begins also known as a stream’s headwaters |
| mouth | place where a stream or river ends, flowing into another body of water |
| velocity | the distance water flows during a given period of time (meters per second or feet per second, etc.) determines whether flow will be laminar or turbulent velocity determines the kind and amount of sediment or load a stream can carry |
| bed load | sediment carried along the bottom of the stream channel larger sediments such as sand, gravel, pebbles, & boulders |
| tributaries | feeder streams |
| topography | physical characteristics of the land |
| gradient | slope of the stream channel |
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