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.
Rock samples brought back from the Moon show absolutely no evidence of chemical weathering. This is most likely due to(1) the lack of an atmosphere on the Moon(2) extremely low surface temperatures on the Moon(3) lack of biological activity on the Moon(4) large quantities of water in the lunar seas13.