How did the Lunar Maria form?

Answer

Lunar Maria was formed as a result of volcanic eruptions on the surface of the moon. They are large basaltic plains rich in iron, covering almost 16% of the moon's surface.
Reference:
Q&A Related to "How did the Lunar Maria form?"
The Lunar Maria formed from the volcanic activity the moon had. Lava flowed from the moons core and filled in the massive holes that was created from meteorites striking the surface
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