Mars rotates on its axis every 24.6 Earth ... The highlands of the southern hemisphere, however, are studded with many extinct volcanoes, and the crust there can get up to 62 miles thick.

Mars is also a dynamic planet with seasons, polar ice caps, canyons, extinct volcanoes, and evidence that it was even more active in the past. It is one of the most explored planets in the solar ...

Some scientists, however, have suggested that current volcanic activity on Mars and Venus may not be so far-fetched after all, with new evidence emerging from recent studies. What Gave Earth Its ...

As Mars’ polar ice caps warm up ... There’s Olympus Mons—the largest extinct volcano in the Solar System, which is roughly the size of Arizona (U.S. states offer good Martian size ...

"Mars has mud volcanoes," Lloyd said ... one suggested that bits of extinct life could be "very well-preserved…it's like pickling something in salt." ...

The answer is Olympus Mons on Mars. Yes. The hill of Arthur’s Seat ... What is the difference between a dormant and an extinct volcano? A dormant volcano is one that is not currently erupting ...