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Detailed explanation-1: -It was home to the largest of the four ancient urban civilizations of Egypt, Mesopotamia, India, and China. In the 1920s, the Archaeological Survey of India (ASI) carried out excavations in the Indus valley wherein the ruins of the two old cities, viz. Mohenjo-Daro and Harappa were unearthed.

Detailed explanation-2: -The Indus Valley civilisation may be even older than initially thought. A group of researchers in India have used carbon dating techniques on animal remains and pottery fragments to conclude that the Indus Valley settlements could be 8, 000 years old-2, 500 years older than previously believed.

Detailed explanation-3: -The discovery of the Indus Valley Civilisation was first made in the 1920s by archaeologists John Marshall, Ernest Mackay, and Harold Hargreaves. While excavating the site of Harappa in what is now Pakistan, they found evidence of an ancient civilisation that was far more advanced than anything they had seen before.

Detailed explanation-4: -In 1912 Harappan seals with unknown symbols were discovered by J. Fleet. This triggered an expedition by Sir John Hubert Marshall in 1921-1922. This expedition led to the discovery of the ancient city of Harappa, thus confirming the existence of the Indus Valley civilization.