amazon river, amazon river study july 2014, amazon flow july 2014 study, amazon river flow, flow of amazon reverse, flow reversal of amazon river, geological oddity: how amazon river flow reversed suddenly, scientists explain how amazon river reversed, The Amazon once flowed in the opposite direction, Why the Amazon flows backward, Why the Amazon flows backward? A river runs backward. Erosion and other processes taking place at Earth's surface help explain why large portions of the Amazon River (watershed depicted in lighter colors) reversed course. IMAGE: JESSE ALLEN/NASA
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