Mars may have had giant explosive volcanoes in its ancient past that spewed billions upon billions of tonnes of rock and ash into the sky. Vast areas of collapsed ground in a region of the planet called Arabia Terra are their likely remains, believe Joe Michalski and Jacob Bleacher. via Pocket http://www.bbc.co.uk/news/science-environment-24348673#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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