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Rock concretions

Rock concretions

E415/0163

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Credit

DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY

Caption

Concretions. Moon rising over the concretions of Red Rock Coulee in Alberta, Canada, at night. These spheroid rock formations are aggregates composed of small crystals that became cemented together. The exact mechanism of their formation is not known. The red colouration is due to the rocks' iron content which has been oxidised on exposure to air. The concretions at Red Rock Coulee are the largest in the world.

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