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Why ancient Indus Civilizations declined: monsoon cycle stopped for 200 years?

  undeciphered Indus script: stories unread Scientists in the past have explained the decline of Bronze-Age civilizations in Egypt, Greece and Mesopotamia by a long-term drought that began around 2000 BC. Now paleoclimatologists propose that a similar fate was followed by our own Indus Valley Civilization, at about the same time. Based on isotope data from the sediment of an ancient lake, the researchers suggest that the monsoon cycle, which is vital to the livelihood of all of South Asia, essentially stopped there for as long as two centuries. The Indus Valley, in present Pakistan and northwest... 
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