
Late May 2010 brought peacock-hued swirls of blue and green to the north Atlantic. The iridescent waters formed a giant arc hundreds of kilometres across, extending from west of Ireland to the Bay of Biscay. The vibrant colours are from tiny organisms, phytoplankton, that grow explosively in the north Atlantic - from Iceland to the shores of France - in the spring and summerPhotograph: MODIS/Terra/NASA
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