Use the drop-down menu to complete the sentence. many of the achievements of the ancient indus valley civilization was due to their advanced knowledge of ~farming ~mathematics ~weather patterns ~geography what physical feature separates the subcontinent of india from the rest of asia? a. indian ocean b. bay of bengal c. deccan plateau d. himalayas what caused the indus valley civilization to disappear? a. heavy flooding b. drought c. foreign invaders d. no known cause