What natural phenomenon causes the Colombian river Caño Cristales to turn vibrant shades of red, yellow, and green?
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Often called the "River of Five Colors," Caño Cristales gets its brilliant hues from an endemic aquatic plant called Macarenia clavigera. During the transition between the wet and dry seasons, these plants turn a striking shade of red, mixed with yellow sand and green moss. Photo: Astromario, Wikimedia Commons, CC BY-SA 3.0.
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Source: Wikipedia (CC BY-SA)
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