Look up at the sky. In many places you will see clouds. There are many different types of clouds. They are all different shapes and sizes.
Some clouds are fluffy, while others are wispy. Some are big and others are small. Some even resemble familiar shapes. Have you ever wondered how clouds are formed? Clouds are made of evaporated water. Evaporation is when water changes from liquid to gas.
Water evaporates from different sources all around you, like lakes, rivers, and the ocean. Can you guess the main source of water for clouds? The main source is the ocean. This is because the ocean makes up such a large part of the world. Seventy-one percent of our earth is covered by ocean. Water evaporates and becomes gas. This gas rises and mixes with particles in the air. It rises and rises until it cools and collects in one part of the sky. This forms a cloud.
The kind of cloud that forms depends on the environment. Different clouds form at different heights. They change depending on the temperature, too. There are three major types of clouds: cirrus clouds, stratus clouds, and cumulus clouds. Each type of cloud looks different.

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