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Filaments of green scum swirl across the surface of Guatemala’s Lake Atitlán in this photo-like image taken by NASA’s EO-1 satellite on November 27, 2009.
A large bloom of cyanobacteria, more commonly known as blue-green algae, spread across Guatemala’s Lake Atitlán in green filaments and strands that are clearly visible in this simulated-natural-color image from November 22, 2009.
Image of the Day