Question

71% of the earth's surface--that's about 362,100,000 square kilometers--is covered by water. Use this information to find the total surface area of the earth.

Answer 1

And since 71% of the Earth’s surface is covered by water, that works out to 362 million km² (139.4 million mi²). Earth’s continents, on the other hand, cover the remaining 149 million km² (57.5 or million mi²). This is a phenomena unique to Earth (at least in our Solar System) since no other Solar planet has liquid water covering a significant amount of its surface.