What happens to a drop of water on a leaf or in the ocean?                          Stage - 1.                            It vanishes into the atmosphere as water vapour.                                 Stage - 2.                           As it rises, the water vapour cools and changes into a drop of water again.                        Stage - 3.                            This drop of water along with other drops forms clouds.                                 Stage - 4.                           The clouds become heavy with water and the water falls down as rain.    Definiton { water cycle}.  The movement of water from the earth to the atmosphere and then back to the oceans and seas is called system .       Slide - 5.                            The sun has a important in the water cycle . The natural processes   involved in the water cycle are evaporation and condensation.             Slide - 6.                             Evaporation is the process by which water on heating changes to water vapour . In this case heat is provided by the sun.                              Slide - 7.                             Condensation is the process by which water vapour, on cooling, changes bask to water . Water vapour cools as it rises up wards.                  Slide -  8.                             Think........                         1. Why do washed clothes dry ?                       2. Why do oceans not overflow ?                           3. Why is the water cycle so important ?