What is a mare on the Moon?
A) smooth floor of an ancient asteroid impact basin, never subjected to inundation by lava or other volcanic activity
B) large area smoothed by deformation and tectonic activity
C) large area of heavily cratered highland terrain
D) very large, ancient lava flow

Question

Quizplus · Accepted Answer

Mares on the Moon are vast, ancient lava flows. They are characterized by their dark, basaltic plains, which were formed by volcanic activity billions of years ago. These areas are smoother and less cratered than the surrounding lunar highlands.

What Is a Mare on the Moon