With reference to Indus Valley Civilization, which one of the following statements is not correct?
1. The art of bronze-casting was practised on a wide scale by the Harappans.
2. Spinning of cotton and wool was not know to Harappan people.
3. One of the best known artefacts from the Indus Valley- A four inch high copper figure of a dancing girl was found in Mohenjodaro.
4. The Indus Valley people made terracotta images also, but compared to the stone and bronze statues, the terracotta representations of human form are crude in the Indus Valley.