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.
Evidence for this theory comes from samples of moon dust, showing that the moon is made of fairly similar rocks to those found in the upper layers of the Earth's mantle and crust. The moon formation crash knocked Earth sideways, changing its angle of tilt to the sun from 0 degrees to 23.5 degrees. As a result, the Earth started to have seasons: winter for the hemisphere tilted away from the sun, and summer for the hemisphere tilted towards the sun.