How the Moon got a makeover
Briefly

Heat from a massive impact on the Moon's far side made the crust unstable, causing heavier minerals to sink and resurface as titanium-rich volcanic rocks on the near side.
The Procellarum KREEP Terrane on the Moon, rich in potassium, rare earth elements, and ilmenite-rich basalts, is explained by high abundances of heat-producing elements from its volcanic activity.
The near side's volcanic activity is attributed to the high levels of heat-producing elements in the PKT region, while the far side lacks these due to geological processes.
Read at Ars Technica
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