The presence of KREEP-rich rocks indicates that the early moon underwent intense melting and differentiation, a process in which the incompatible elements were concentrated in the molten part of an increasingly solid, crystallized system.

• 富含KREEP岩石的存在，表示早期月球曾受强烈的熔化和分异作用；这个过程中，不相容元素会凝聚在逐渐固化、结晶系统中的熔融部份。