Consider the following statements with reference to decline of the Indus Civilization-
1. Around 1800 BCE, signs of a gradual decline of the Indus Civilization began to emerge, and by around 1700 BCE, most of the cities were abandoned.
2. In 1953, Sir Mortimer Wheeler proposed that the decline of the Indus Civilization was caused by the invasion of an Indo-European tribe from Central Asia called the "Aryans".
3. As evidence, he cited a group of 37 skeletons found in various parts of Mohenjo-Daro, and passages in the Vedas referring to battles and forts.
4. Today, many scholars believe that the collapse of the Indus Civilization was caused by drought and a decline in trade with Egypt and Mesopotamia.
5. It has also been suggested that immigration by new peoples, deforestation, floods, or changes in the course of the river may have contributed to the collapse of the IVC.
6. Recent archaeological excavations indicate that the decline of Harappa drove people eastward. After 1900 BCE, the number of sites in India increased from 218 to 853.
7. Excavations in the Gangetic plain show that urban settlement began around 1200 BCE, only a few centuries after the decline of Harappa and much earlier than previously expected
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