Over the centuries natural disasters — perhaps earthquakes or great river floods — appear to have weakened the urban civilization of the Indus Valley.
Selama berabad - abad, bencana alam ​ — mungkin gempa bumi atau meluapnya sungai secara besar - besaran ​ — tampaknya telah melemahkan peradaban masyarakat kota Lembah Indus.