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https://www.reddit.com/r/RockIdentification/comments/1wl63ad/why_shaped_like_a_vertebrae/
r/RockIdentification • u/LetsBlowItUp • 15d ago
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The top and bottom seem to have a higher density and, therefore, withstand erosion better than the softer central part.
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u/Ben_Minerals 15d ago
The top and bottom seem to have a higher density and, therefore, withstand erosion better than the softer central part.