The water cycle.

Evaporation:

Evaporation is when the sun fires up water in rivers or lakes or the ocean and turns it into vapor or steam. The water vapor or steam goes away from the river, lake or ocean and goes into the air.

Precipitation:

Precipitation occurs when so much water has condensed that the air can't hold it anymore.  The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow.

Condensation: Condensation happens when the water vapor in the air gets cold and changes back into liquid, forming clouds. This is called condensation. You can see the same sort of thing at home...  Pour a glass of freezing water on a hot day and watch what happens.  Water forms on the outside of the glass.  That water didn't somehow leak through the glass!  It actually came from the air.  Water vapor in the warm air, turns back into liquid when it touches the cold glass.