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.
In the early 1970s, Dr William K Hartmann proposed that the early Earth collided with a planet the size of Mars, sending debris into the battered Earth's orbit. He theorised that the Moon formed from this debris. This clip refers to the Moon as being dry.