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Devils Tower National Monument

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Devils Tower National Monument
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Uploaded by Sue Lawrence on 11 Aug 2018 in Birmingham

Devils Tower's column erosion with abundant crustose lichen showing on the rocks. It takes a year for crustose lichen to grow 1-2 millimeters in diameter; and, since it takes 25.4 mm (millimeters) to make up just one inch, that's really slow-growing stuff.

Tagged: devilstower devilstowerscolumns lichen lichenonrocks towererosion wyoming

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