Did you Know The surface of the earth measures 510 million square kilometers. The 5 continents make up a total of 29.3 percent of the earth`s surface, that`s about 149 million square kilometers land area, the rest is occupied by the oceans, seas and islands. The water surface in contrary is about 361 million square kilometers, representing about 71 percent of total surface of the earth. About 7 billion people live on our planet. One-third of all people on our planet live in China and India. One percent of the world population lives In Australia and Oceania.