This is Mawrth Vallis on Mars, and it’s Positively Bursting with Evidence of Past Water Action on Mars
Here on Earth, geologists seek out deep channels into Earth’s rock, carved over the ages by flowing water. The exposed rock walls are like a visual timeline of a region’s geological history. On Mars, the surface water is long gone. But it flowed long enough to expose layers of rock just like here on Earth. …
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