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 any case, we see only a portion of the moon at a time as it keeps moving in its orbit. The reason why we see moon growing (waxing) and shrinking (waning) is because of the light of the sun emitted by the moon to us. There is no light of the moon, and it only emits the light of the sun falling upon itself.