Water cycle

1. The water cycle is basically the system of condensation, evaporation, runoff, and precipitation that refreshes and purifies our water and transports water from the ocean onto land (or vice versa).
   
2. The same water we have now has been around sinse the Earth first formed water, so it might have begun billions of years ago and it will never have and end until the water is somehow gone from the earth. It is a continuous cycle.
   
3. First the water in the puddle evaporates and turns into water vapor, then it condenses on dust or pollution particles until its gets heavy enough to fall down as possibly rain.