9781422283721

But Mars is much colder than the Earth, with freez- ing temperatures for most of the time. Each of the near planets has a differ-

ent kind of surface from the Earth and from each other. Mercury has an old, heavily cratered surface. The surface of Venus, on the other hand, is relatively young. There are only a few craters but plenty of volcanoes. Mars has craters and volcanoes, all of them ancient. The planet is a rusty red color, and is known as the Red Planet.