The Water Cycle. The energy from sun drives the water cycle which in turn drives the weather. Weather is affected by the amount of water vapor in the air. Water never leaves the Earth. It is constantly being cycled through the atmosphere, ocean, and land.
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The sun heats up liquid water and changes it to a gas (water vapor) by the process of evaporation. Water that evaporates from Earth’s oceans, lakes, rivers, and moist soil rises up into the atmosphere.
The process of evaporation from plants is called transpiration. (In other words, it’s like plants sweating.)
RELATIVE HUMIDITY-Amount of water vapor in the air compared to the maximum it can hold
The warmer the air, the more water vapor it can hold.
As water vapor rises higher in the atmosphere, it starts to cool to it’s dew point and become a liquid again. This process is called condensation.When a large amount of water vapor condenses, it results in the formation of clouds.
RUNOFF – Water that flows across the land and collects into streams, rivers and eventually oceans. Water that collects in rivers, streams, and oceans