Crust on Moon forms

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Crust on Moon forms 4400 mya

The anorthosite crust forming the highlands of the Moon forms. The oldest minerals found on the surface of the Earth, zircons from the Jack Hills conglomerate in Australia, formed at this time. The Earth's proto-ocean and proto-atmosphere also formed. The Earth's crust begins to differentiate from the mantle.
Source: (Wikipedia)

Keywords: evolving_earth, astronomy, geology