Give four reasons that how Harrapa and mohenjo daro lost its significance.
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The Harappan Civilization or the Indus Valley Civilization was the most fascinating and first urban civilization in the world that flourished in the vast plains created by the River Indus and its tributaries. The Harappan Civilization thrived between 2600 – 1900 BC in the region that is now in Pakistan and India. With the population of over five million, this civilization had a well developed trade system, cities, sewerage system, metallurgy techniques with many other mathematical and scientific achievements.
But with time, there was shrinkage in the Harappan Civilization. For instance, Mohenjodaro, one of the major cities of this civilization, earlier flourished on about eighty five hectares of land but later on got confined to just three hectares. Due to some reason, population from the Harappa started moving to the nearby and outer cities and places like Punjab, Upper Doab, Haryana, etc. But what leads to the decline of the Harappan Civilization is still a mystery.
Proposed theories regarding the decline of the Harappan Civilization
Definite reason that led 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. Though the reason of the decline is not known, but through excavations it is clear that fall of the Harappan Civilization occurred between 1800 BC to 1700 BC.
It is commonly believed that the Aryans were the next settlers. They were skilled fighters, so their attack might have led to the destruction of the Harappan Civilization. Even the epics of the Aryans mentioned about their victory over the great cities. The human remains found during excavation of Indus valley point towards some violent cause of their death. Now many historians, who do not believe this theory, say that the Aryans might not be involved in any such attack.
Owing to this conflict, the theory of a huge climatic change or natural disaster gained credibility. It has been found out that around 2000 BC some major climatic changes started occurring in the Indus Valley. These changes had led to floods in the plains and cities. Historians have found evidence to prove this theory as well. Most of the cities in the Harappan Civilization have been found in a condition as if these had been first abandoned and then rebuilt.