Simple Definitions
evaporation:  when water changes into vapor
Water in lakes, ponds, rivers, and oceans evaporate into the air when the sun heats it.
transpiration:  loss of water through plant leaves
Transpiration is similar to evaporation.  The water is from plants instead of the lakes, rivers, and oceans!
condensation:  when water vapor becomes liquid water
Clouds form because the water vapor in the air condenses high in the sky into water droplets again.  Clouds are made of water!
precipitation:  water that falls to the ground; it can be rain, hail, sleet, or snow
runoff:  precipitation that falls into rivers and streams
groundwater:  water that sinks into the ground after precipitation and fits into the tiny spaces between soil and rocks
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