Scientists believe that the mantle of Mars contains enough water to cover the planet's entire surface.
Meteorites from Mars have been found to contain enough hydrated minerals to suggest that the planet contains as much as 300 parts per million of water, an amount that is even in excess of that found on the Earth. "Basically the amount of water we're talking about is equal to or more than the amount in the upper mantle of the Earth," said study leader and planetary scientist Francis McCubbin.
The research indicates that some of Mars' volcanoes likely brought large amounts of water to the surface at a time when the temperature was sufficient to support it and increasing the chance that Mars may have once been a place hospitable to life.
"Mars could have entire oceans' worth of water locked in rocks deep underground, scientists say."
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Source: National Geographic
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