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HIGH AND DRY

Settlements (red dots) appeared along the rivers of the Indus Valley starting about 5,200 years ago (left). But after 3,900 years ago (right), drier conditions may have pushed the Harappans eastward, leading to the decline of cities. Credit: L. Giosan/WHOI, Stefan Constantinescu, Univ. of Bucharest, James P.M. Syvitski, Univ. of Colorado

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