Earth is called a________ planet.

The correct answer is: Blue

The correct option is b)Blue.

• The third closest planet to the Sun is Earth. Appearing blue from space, it is called the blue planet because two-thirds of her surface is covered with water.
• This means that 71% of the earth is covered with water.
• It is the fifth largest planet in terms of size.
• It is slightly flattened at the poles. The shape of the earth is defined as a geoid.
• Conditions conducive to life are probably found only on Earth.
• There is air and water there, which is very important for life.
• Air contains life-sustaining gases such as oxygen. From space, it appears blue because of these bodies of water.