![](http://www.alamy.com/thumbs/6/463B96D2-BB41-4CDE-93A3-7554B2A6C2D3/2WYJHK1.jpg)
Black Mountain (Kalkajaka) National Park. Grey granite boulders are blackened by a film of microscopic blue-green algae growing on the exposed surface
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Photo credit: © Stephen Dwyer / Alamy / Afripics
License: Licensed
Model Released: No
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