Looking at Martian Salts and Clays
This 3D perspective view is a composite of both HiRISE and data from CRISM, another instrument onboard MRO. This view covers a small patch of ancient Martian real estate in Terra Sirenum. CRISM collects spectral data that can be used as a chemical fingerprint for the upper most surface. This information suggests that this small patch of surface is covered with salts (chlorides) represented in gree and water-rich clays that appear blue.
IMAGE AND WORD SOURCE: NASA/JPL/University of Arizona
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