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Photo Gallery: Floods

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An astronaut's photo from 2008 shows the lower Amazon and several tributaries in flood. Each year, this mighty South American river swells with rain and meltwater from the Andes. At its highest, the Amazon will rise upwards of 30 feet (9 meters), submerging its entire floodplain, providing habitat for countless aquatic animals, and replenishing the landscape with nutrient-rich silt. Photograph courtesy NASA