The Earth is the most beautiful planet in the Solar System. It is the planet on which we live. It is spherical in shape, which means that it is round. It is also very old. There are eight planets. The Earth is the fifth largest planet among them. The Earth is always moving around the Sun. When the Earth moves, we also move. It is also called the "Blue Planet" because it has lots of water. The Earth is the only planet which has air and water. Fresh air and water are very important to live.Why is the Earth called the 'Blue Planet'?

• A. Because it has air       
• B. Because it has sky
• C. Because it has water   
• D. Because it has greenery
• E. None of these