False-colour satellite image of the Atlantic Ocean, showing the density and distribution of phytoplankton in the surface water. The colours represent varying phytoplankton densities from red (most dense) through yellow, green and blue to pink (least dense). Land areas are coloured grey. The highest phytoplankton densities occur in nutrient-rich coastal waters and as a seasonal bloom across the northern Atlantic. 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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