The air has water vapor that constantly hits with dust, salt, and other tiny particles floating in the air. These tiny particles are aerosols. The water vapor sticks to the aerosols when the air is cooled. This process is called condensation. Then, these water droplets start clinging with other droplets until they become a bigger collection of tiny droplets of water. When very tiny droplets of water or ice crystals gather together, they form clouds.
Clouds have three main types.
Cirrus clouds are high clouds that feathery and fine. The ice crystals make these clouds white. Cirrus clouds predict there would be a fair weather.
Stratus clouds are low-level clouds that are thick, grayish, and flat. They usually cover the sky completely.They also bring rain or snow.
Cumulus clouds are also known as fair-weather clouds. They have flat bottoms and lumpy upper parts that make them look like pieces of puffy cotton hanging in the sky. In a fine day,they are low-level clouds but, in an unstable atmosphere, they can become bigger , higher, and turn into cumulonimbus that bring heavy rain, snow, hail, or tornadoes. Cumulonimbus has a shape of an anvil. 
Try this!
I. Rearrange the jumbled letters to form a word based on the meanings provided
1. They are fair-weather clouds.
U C L U S M U ______ ______ ______ ______ ______ ______ ______ clouds
2. They bring heavy rain, snow, and hail.
M O C L U B N U N U M I S ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ ______ clouds
3. Low-level clouds that cover the sky entirely.
T S U T S R A ______ ______ ______ ______ ______ ______ ______ clouds
4.They are fine and wispy.
U R I R C S ______ ______ ______ ______ ______ ______ clouds
Complete the table by writing down the sentences describing each type of clouds.
Cirrus Clouds | Stratus Clouds | Cumulus Clouds |
They also bring rain or snow.
They are high clouds that feathery and fine.
They are low-level clouds that are thick, grayish, and flat.
They predict there would be a fair weather.
They have flat bottoms and lumpy upper parts that make them look like pieces of puffy cotton hanging in the sky.
They usually cover the sky completely.
Clouds that are also known as fair-weather clouds.
They can become cumulonimbus clouds that bring heavy rain, snow, hail, or lightning.