Answer:

The process of evaporation followed by condensation causes the formation of clouds. Water present on the earth’s surface gets evaporated due to sunlight, and then rises up in the atmosphere. On reaching a certain height, water vapour present in air condenses to form tiny droplets of water. These water droplets collect to form clouds that float in air.

OR

Clouds are tiny droplets of water or crystals of ice, which float in the air. They are able to float since they are very small. Air gets moist or damp as a result of the evaporation process that takes place by the sun. This moist air rises from the surface of the earth and progresses higher only to become cooler furthermore. At sufficient altitudes, water vapour present in the air condenses to form droplets. These droplets remain in the air and appear to us as clouds.

After reaching a point called frost point in the atmospheric air, droplets stop rising further.

Dewdrops in the sky, then come together and form large water droplets – a cluster of water molecules, which we address as clouds. The clusters start getting heavier as a result of millions of droplets tending to clamp with them. The quantity of droplets in the cloud depends upon the atmospheric temperature and pressure.

Once these clouds get denser and saturated, they fall down to the ground as precipitation which we call rains.

Snow or hailstones are a result of larger water molecules falling to the ground because of colder temperatures in a region