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As humidity is dependent on temperature, wind and other factors, these factors affect evaporation too. There are a multitude of factors, including relative humidity, that govern the process of evaporation whether it is occurring at a small laboratory or over the surface of a huge water body like a lake or ocean.
Evaporation: Heat from the Sun causes water on Earth (in oceans, lakes etc) to evaporate (turn from liquid into gas) and rise into the sky. This water vapor collects in the sky in the form of clouds. Condensation: As water vapor in the clouds cools down it becomes water again, this process is called condensation. Precipitation: Water falls from the sky in the form of rain, snow, hail, or sleet, this process is called precipitation. Collection: Oceans and lakes collect water that has fallen. Water evaporates into the sky again and the cycle continues.