Water covers most of our planet. It can be found in oceans, lakes, and ponds, and in the ground itself. The cycle of water from liquid to vapor to solid is called the water cycle. The water cycle is an exciting and continuous process, with no beginning or end. The water cycle is the movement of water in the environment by evaporation, condensation, and precipitation.
The warm sun causes liquid water to evaporate (to change from a liquid into a gas or vapor) and rise up into the sky. The water vapors that are formed cool during evaporation. These cooled water vapors form clouds in the sky. The transformation of the vapor into clouds (that is, from a gas into a liquid) is condensation. Clouds can be a mass of water droplets and/or ice particles. When the clouds get heavy enough, the water falls back to the ground in the form of rain, snow, or hail. This is precipitation.
taken from: http://www.abcteach.com/free/r/rc_watercycle.pdf
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