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The earth condensed from gas into liquid into solid. Rocks are assumed to be solids and not a fluid part of a melt. Bowens Reaction Series implies that the first rocks on earth would have been Olivine Polymorphs. MgSiO3-perovskite and MgO (periclase) are likely candidates from observations at the Earths Moho. As far as the "rock cycle" goes; these ...

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