Mysteries of the Upper Atmosphere : Documentary on the Air at th Edge of Space (Full Documentary). . Mysteries of the Upper Atmosphere : Documentary on the Air at th Edge of Space (Full...
Earth, also called the world and, less frequently, Gaia (and Terra in some works of science fiction) is the third planet from the Sun, the densest planet in the Solar System, the largest of...
In the very beginning of earth's history, this planet was a giant, red hot, roiling, boiling sea of molten rock - a magma ocean. The heat had been generated by the repeated high speed collisions...