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In this underwater shot, a woman in a teal long-sleeve shirt, green leggings, blue flippers, and black snorkel and mask floats just at the surface of the water, holding a fuzzy brown ball out in front of her. In the background is bright blue water, and the sea floor is covered in more of the fuzzy brown balls.

Overgrown Cyanobacteria

OCEANOS instructor Anabella Zuluaga holds two clumps of cyanobacteria, likely caused by runoff from on-land pollution, in the waters of Playa Melones, Culebra (Puerto Rico). In the background, a dark brown carpet of cyanobacteria litters the ocean floor all around a coral 'farm.'

Image Credit: NASA/Milan Loiacono
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Image CreditNASA/Milan Loiacono
Size6000x4000px