The early earth was molten, and a liquid in a vacuum subject only to its own gravitational forces will assume the shape of a sphere. Gases will behave in the same manner. The effects of the sun and other planets, plus the rotational effect have caused the earth to assume a spherical shape.
hope that helps;)
posted 一年多以前
Not to argue, but what 你 quoted is a scientific theory not necessarily fact, :)
