Why did the water on Mars disappear?

Was the disappearance caused by Mars’ magnetic field failing?

via SyFY

This is tied closely with what happened to the Martian atmosphere. Mars has very little air now, just 0.6 percent of Earth’s atmospheric pressure. That’s too low to support liquid water on the surface: Water boils are lower temperatures in thinner air — where I live in Colorado water boils at about 94° C (200°F). Mars must have had a much thicker atmosphere back in the day, three or more billion years ago, to be able to have standing liquid water on its surface without it all boiling away.

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