Planet Earth from space

Planet Earth from space

. As illustrated in this image of Africa, the Arabian peninsula, and the Indian Ocean, the Earth's surface consists of continents and oceans. The Antarctica ice cap is also shown, gleaming white at the bottom. Continents cover a little more than one-quarter of the Earth's surface, while ocean water covers almost three-quarters of the surface. This image was taken by Apollo 17 astronauts in December 1972 as they left the Earth en route to the Moon. (Courtesy of NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University