Q. How the water from rains go back to the oceans again?
Rain is a form of precipitation (weather that falls from the sky, basically). It is caused when clouds (made of water vapor) absorb too much moisture. This causes the little drops of water vapor to bunch together into larger and larger drops (the process is called condensation). Eventually the drops get too heavy for the air to hold them up so they fall to the earth: rain. Once the rain hits the ground it usually goes to one of two places: it merges with the natural groundwater or gets channeled by man-made sewage and runoff systems.