WHY IS EARTH CALLED THE 'BLUE PLANET' [ ANSWER IN BREIF ] Share with your friends Share 3 Parv answered this because about 71 percent of earth is covered with water 2 View Full Answer Parismita Sharma answered this Earth is known as the blue planet because it is the only planet that supports life. 3 Nripendra Mishra answered this earth is called blue planet because it has life on it and also because it has 3/4th percent of water on it. 0 Shrenik Garg answered this it is called blue planet because of the water present on earth. 0