Why is the earth called the 'blue planet'?

Explanation:

The abundance of water on the surface of the Earth has earned it the name "Blue Planet."

About 71% of the Earth’s surface is covered with water.

Water is the main composition present in most of the living organisms.

Liquid water, on the other hand, is a scarce resource in our solar system.

Final answer:

Earth is called the “blue planet” due to the presence of high amount of water.