How is rainfall formed?

Answer 1

Water vapor (that has evaporated) condenses into cloud droplets in the cooler atmosphere. Many of these droplets form clouds. When enough water molecules with the clouds form together, they become too heavy for the upward flowing air to keep them in the cloud. The droplets then fall back down to earth as precipitation, rain being the most common form.

Answer 2

vapours of evaporated water as well accumulated within clouds. when go down towards the land so the gravity shapes them as drops

Answer 3

First we need the 'seed crystals' - the "sites of nucleation". Around these form cloud water droplets; and it takes ten thousand cloud water droplets to form one raindrop.