Biocrusts over Head (image)

Caption
The desert outside Chandler, Ariz., shows a darkening of the biocrust (left) over its surface.
Credit
Ferran Garcia-Pichel, Arizona State University
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Arizona State University
The desert outside Chandler, Ariz., shows a darkening of the biocrust (left) over its surface.
Ferran Garcia-Pichel, Arizona State University
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