Why was Harappa badly destroyed compared to Mohenjodaro?

1) Natural calamities
2) Invasion by foreign armies
3) Extensive brick robbery
4) Negligence of preservation efforts

3

The discovery of Harappa preceded that of Mohenjodaro, but unfortunately, Harappa suffered significant damage due to extensive brick theft. As early as 1875, Alexander Cunningham, the inaugural Director-General of the Archaeological Survey of India (ASI) and revered as the father of Indian archaeology, documented that the amount of brick taken from the ancient site would have been sufficient to construct a railway line stretching approximately 100 miles between Lahore and Multan. Consequently, numerous ancient structures at Harappa were adversely affected. In contrast, Mohenjodaro fared much better and experienced superior preservation.