This depletion may be a result of precipitation of these elements into the interior of the planet.. 
jẹ́ aṣe-oko-giga to gba ẹbun Nobel ninu ọrọ-itọkasi.Awon Ọjọ́ìbí niàwọn ẹlẹ́bùn ninu oro-ede ẹlẹ́bùn ara Amerika ará Amẹ́ríkà.. 