Cross-bedding seen in the layers of this Martian rock is evidence of movement of water recorded by the waves or ripples of loose sediment the water passed over, such as a current in a lake. This image is from NASA Curiosity Mars rover.
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Details
Title: Martian Rock Evidence of Lake Currents
Creator: NASA/JPL-Caltech/MSSS
Date Created: 2014-12-08
Rights: JPL
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