- Earth's moon took form in a cosmic collision about 4.5 million years ago.
- The moons original molten surface over time and was intensely bombarded.
- Eventually the tumult died down and the moon turned into the quiet, dusty.
- Next,molten rock welled up from the moons interior and flooded the basins and creating the moons sea's called maria.
- The moon is one - fourth the size of earth and has the fifth largest satellite.
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