i took this photo at Mølen in Norway which has a very special geology. the area is a glacial morraine which is right on the seashore. the glacier from the last ice age had gathered together all kinds of different kinds of rocks from an exceptionally wide area, polished them smooth and dropped them under the surface of the sea. the land rose as the weight of the glacier disappeared leaving them along the seashore. the darker colored ones are wet from crashing waves while the lighter ones are dry
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From @eolianpariah2