The dark,relatively smooth regions of the Moon's surface are the

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The dark, relatively smooth regions of the Moon's surface are called maria. These areas are believed to have been formed by ancient volcanic activity that filled in large impact basins with dark lava flows. The lighter regions on the Moon's surface are called terrae, which are higher in elevation and dominated by older, cratered terrain. Craters and ejecta blankets are distinct features formed by impacts from objects such as asteroids or comets.

The Dark,relatively Smooth Regions of the Moon's Surface Are the