Martian volcanoes 'may be active'

Fields of volcanic cones discovered at the North Pole of Mars suggest the Red Planet could still be geologically active, scientists have said. The cones, seen in images from Europe's Mars Express probe, have no blemishes from impact craters. This suggests the volcanoes erupted very recently and that the sites could have ongoing volcanism.

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http://news.bbc.co.uk/2/hi/science/nature/4219858.stm