New evidence suggests that three volcanoes on Mars may be dormant and not extinct as was previously thought. This possibility has arisen from comparisons of Mars volcanoes to those in Hawaii. These Martian volcanoes are much bigger than those on Earth being around 186 miles across. Land features suggest that one of the volcanoes erupted relatively recently. It is the new images that are being taken of Mars' surface that are allowing these new inquiries. There is still a lot of missing data and unclear explanations that need to be worked out.
http://www.marsdaily.com/reports/Hawaii_Reveals_Steamy_Martian_Underground_999.html
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