Drought and flooding led to collapse of Angkor

According to tree-ring chronology, the ancient capital of the Khmer Empire experienced persistently dry conditions followed by years of monsoons that partially damaged infrastructure, researchers say. A prolonged drought punctuated by intense monsoons that partially destroyed the city's water-preservation infrastructure led to the 15th century collapse of the ancient city of Angkor, capital of the Khmer Empire, U.S. and Asian researchers reported Monday.

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