Tag: How old is the world?

Only about 29 percent of Earth’s surface consists of land; the remaining 71 percent is water or ice. Thus, less than one-third of our planet is habitable by human beings, and much of this area is too dry, too cold, or too rugged to allow large concentrations of settlement. Our livable world-where permanent settlement is possible-is small indeed. Each of the six continental landmasses possesses unique physical properties, some of which are listed