Question

how does rain occur and what is the advantage of rain.I have one doubt "lets simply take that the earth has 1000 litres of water and if 100 liters of water has been evaporated and forms cloud and again if it falls as rain means what is the profit for us, in 1000 liters 100 liters evaporated means 900 liters are remaining and when the rain comes again 1000 liters are there what is the profit or advantage "plzz clarify me.​

Answer 1

temperature balanced

And whole 100 liters of water is not come back little bit less , which is used for balanced temperature