This is an image of some Martian volcanoes.
Click on image for full size
Image from: NASA
The History of Martian Volcanoes
During its earliest history, Mars was hit with many asteroid-like boulders. The impacts of these boulders caused Mars to become warm enough for continents to drift across the surface just as they do on Earth to this day.
What is now the highlands of Mars may have once been a huge continent which froze in place, in the south, when the crust became too thick to move.
After the crust became too thick to move, a warm bubble of material, rose from the deep interior of Mars and created the Tharsis Bulge and the volcanoes. The volcanoes poured out a new surface over the lowlands of Mars.
After this however, all volcanic activity on Mars stopped.
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