DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY DR GENE FELDMAN, NASA GSFC / SCIENCE PHOTO LIBRARY
False-colour satellite image of the Mediterranean Sea, showing the distribution of phytoplankton in the surface water. The colours represent varying phytoplankton densities from red (most dense) through orange, yellow and green to blue (least dense). Land areas are coloured black. The Mediterranean is fairly barren compared with the plankton-rich waters of the Atlantic (left) and the Black Sea (upper right). The image was produced from data acquired by the Coastal Zone Colour Scanner, one of the instruments on NASA's Nimbus-7 research satellite.
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