'Traces of cals have been found at the Harappan archaeological site of Shortughai in Afghanistan but not in Punjab or Sindh.'
Identify the explation provided by archaeologists from the following:
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For board exams, the standard NCERT-derived answer for why cals are not found in Punjab/Sindh is: “It is highly likely that ancient cals in these regions silted up long ago.” Keep this primary explation in mind for descriptive answers.