What is the water cycle?

The water cycle consist of four main things, evaporation, condensation, precipitaton, & collection. 

The earth has a limited amount of water. So we have to have the cycling of water. Therefore, thats how they get the name, "Water Cycle". Water covers about 71% of the earths surface. The water cycle constantly keeps going and never stops, because there is there is a constant supply of water. Everything needs water: plants, animals, and humans.