Clouds are collections of microscopic water droplets and ice crystals that float in the air. They are made up of millions of particles. These millions of little particles are water droplets that have evaporated from oceans, lakes, rivers, and so on.
Clouds give the most accurate clue about the coming weather. Certain types of clouds often appear before a storm. A smokestack of clouds is a very good prediction of a thunderstorm.
Storm clouds often look gray because they are so thick that most of the sun’s light cannot pass through them. The heating and cooling of the earth is regulated by clouds.
The reason, clouds are white is because of the sunlight passing through them. The sunlight hits each individual drop of water in the clouds which in turn breaks down the light like a spectrum. Eventually, all the colors are reflected to form the color white. A cloud may look light and fluffy but a relatively small cloud can weigh up to 550 tons.