precipitation

 

when the temperature and atmospheric pressure are right,the small droplets of water in clouds form larger droplets and precipitation occurs.The raindrops fall to earth.As a result of evaporation , condensation and precipitation,water travels from the surface of the earth goes into the atmosphere and returns to earth.Further, much of the water that returns to earth as precipitation runs off surface of the land and flows down hill into streams,rivers, ponds and lakes.And small streams flow into larger streams then into rivers and eventually the water flows into the ocean.This process is called precipitation.