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Ancient supervolcanoes revealed on Mars

A series of Martian craters assumed to have been formed by meteorites may actually be extinct volcanoes so massive that, when they were active billions of years ago, they could have buried Mars in ash.
The craters pepper the surface of Arabia Terra, a geologically ancient region of northern Mars.

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Supervolcanoes ripped up early Mars

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.
The two scientists report their findings in this week's Nature journal.

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