Photo: Mars's Ice Patchy, Water Cycle Quite Active, Study Reveals

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A false-color image shows the patchy depth of Mars's ice table in a region of the planet's northern hemisphere.

In blue areas, the ice begins just 2 inches (5 centimeters) below ground, while in red locations the ice layer is at least 7 inches (18 centimeters) deep.

Image courtesy NASA/JPL/Arizona State University

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