What geological features are the dark patches on the Moon known as maria?

Answer

Ancient basaltic lava basins

The dark patches referred to as maria are low-lying basins that formed early in the history of the Moon. They were created when massive asteroids impacted the surface, cracking the lunar crust and allowing magma from the interior to rise and fill these basins, eventually solidifying into basaltic lava.

What geological features are the dark patches on the Moon known as maria?

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