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Iceberg 'doodles' trace climate history


Still Waters

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What you see are actually the great gouge marks left on the seafloor when the keel of a giant block of ice has dragged through the sediments.

The arcs and loops record the movement of the berg as it turns about, caught in the wind, currents and tides.

This "ice art" is from a stunning new collection of images that detail how glacial action has shaped the ocean floor in Earth's polar regions.

http://www.bbc.co.uk/news/science-environment-39694623

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