How did the Moon, if formed through an impact of the Earth and resultant material, become such a dead planet so quickly?
How did the Moon get the lunar Ring of Fire yet there are no active volcanoes now?
Where did the Moons gravity go?
Moons Ring of Fire
Though the exact boundaries and morphology of the vast nearside basalt flood plain are still poorly understood, it's now clearer that the Moon once had its own "Ring of Fire," less dynamic than on Earth, but still a 'squarish' border in the form of deep volcanic rift structures partially surrounding an enormous plate.
A rille to rover over near Rimae Hevelius