Question

how do we know about harrappa culture​

Answer 1

Answer:

Indus civilization, also called Indus valley civilization or Harappan civilization, the earliest known urban culture of the Indian subcontinent. The nuclear dates of the civilization appear to be about 2500–1700 bce, though the southern sites may have lasted later into the 2nd millennium bce.

Explanation:

In 1912, Harappan seals with then unknown symbols were discovered by J. Fleet, which triggered an excavation campaign under Sir John Marshall in 1921/22, resulting in the discovery of a hitherto unknown civilization by Dayaram Sahni.