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The moon formed when their was a massive collision between the proto-earth and another planetoid.
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After the collision of the planetary, it caused a high temperature of heat that caused the entire earth planet to melt and form a ocean of the magma
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Mental formed because of the light substances, for example, oxygen and silicon. Heavy substances, for example iron and nickel sank down to the central area and formed a nucleus.
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After the number of collision of planetary decreased, the ground surface started to cool and formed a strong primordial crust.
KEY: Also the vapor changed to rain and it flocked to the primordial crust and formed a paleo-sea. -