Students enrolling in Carnegie Mellon University Tepper School of Business have an average GMAT of 690, which is much higher than average compared to all business schools (613).
But how did it end up being this pure in most parts of the Moon? The secondary event that explains it, notes the report, is what researchers are calling a crustal overturn. Old impure plagioclase was replaced by hot, pure plagioclase as the moon cooled rapidly. Asteroid hits, space dust, and other harsh space conditions could have also sheared away the surface impurities, notes the report.
The force of gravity makes sure that it does not float away from the earth and makes it revolve around it. The fact that the moon does not crash into the earth is because of the tangential velocity of the moon, in a direction perpendicular to the direction of the force. In fact, the revolution of the moon around the earth is due to two causes: the tangential motion and the constant falling towards the earth.