Q. Which of the following was one of the cause of Harappan decline?

Explanation by: Siddharth M

Definite reason to the decline of the Indus Valley Civilization is not known, as no reliable resource of that period is available at present. Every conclusion regarding the decline is based upon speculations of historians. It is commonly believed that ecological change, earthquake, Aryan attack, etc. were the causes of Harappan decline.