Most of the dark regions on Mars visible from Earth are:
A)features like the Valles Marineris.
B)lava flows from active volcanoes.
C)mountainous regions.
D)the seasonal growth of vegetation on the planet.
E)volcanic planes like the lunar maria.

Question

Quizplus · Accepted Answer

The dark regions on Mars visible from Earth are volcanic planes similar to the lunar maria. These regions are known as "mare" which means "seas" in Latin. They were formed due to volcanic activity in the past and are made up of dark basalt rock. The dark regions visible on Mars from Earth are mostly volcanic planes similar to lunar maria. These regions are referred to as "maria" on Mars and are composed of basaltic lava flows that are hundreds of kilometers in extent.

Most of the Dark Regions on Mars Visible from Earth