-Why is is it difficult for historians to study the Harrapan people of the Indus River Valley?

Historians did not learn much about the Harappan civilization from written sources because its writing system has not yet meen figured out. They learned much from building remains, like the drainage system, and where grains were stored.

Explanation:

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.