What is the water cycle?
It never stops!
When the sun/heat source heats up water (e.g. river, lake, puddle) and it turns to water vapor. Liquid - Gas.
When the air (clouds) become too full of water and makes precipitation. (e.g like a sponge)
Water falls back to earth from clouds (e.g, rain, snow, hail, sleet and lands in a lake or other bodies of water. And it is moisture falling to earth from the clouds.
When water vapor (gas) cools to become a liquid. When cool water is in a bottle on a hot day it is like the water bottle is sweating. Gas - Liquid.
It is the gas form of water caused by evaporation. Sometimes you can see it and sometimes you cant. You can see it when it is foggy out. You cant see it when it is clear.
The amount of water vapor (gas form of water) in the air
warm air = more humidity it is the amount of moisture in the atmosphere.