Clouds are visible phenomena that happen in the sky (earth's atmosphere).Other phenomena happen in the sky too.
Clouds are the most beautiful things nature has ever produced.
There are 3 main types of clouds :
Cirrus clouds are so high they are made of ice particles.
Stratus clouds look like flat sheets. They may stay in one place for several days.
Cumulus clouds look like pieces of floating cotton. If they grow tall, they can turn into storms.
Clouds can be low, medium or high altitude.
Some other planets in are known to have clouds.
Mammatus clouds, or 'breast' clouds. They are made of milk.
To learn more about cloud types