All Entries Tagged With: "blue marble"

EARTH, A PLANET

I INTRODUCTIONEarth (planet), one of nine planets in the solar system, the only planet known to harbor life, and the “home” of human beings. From space Earth resembles a big blue marble with swirling white clouds floating above blue oceans. About 71 percent of Earth’s surface is covered by water, which is essential to life. [...]