Rock concretions

Rock concretions

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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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Keywords: alberta canada, canada, concretion, earth science, geology, geomorphology, moon, over red rock coulee, red rock coulee, rock formation, rocks, sedimentary rock, world's largest

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