INDIAN HISTORY

Detailed explanation-1: -Iron was not known to the Harappan people. Since the civilization existed during the Bronze Age, it had made many metallurgical advances in copper and bronze but not in Iron.

Detailed explanation-2: -Gold, copper, silver, bronze metals were known to Indus Valley Civilization but not iron. The Indus valley people or Harappan people not discovered iron.

Detailed explanation-3: -Horse animals was not known to the people of Indus Valley Civilisation.

Detailed explanation-4: -The Harappan people knew the uses of Iron, Copper and Bronze .

Detailed explanation-5: -Indus civilization was a Bronze age civilization hence they were unaware about of Iron.