Why is Harappan Civilisation called a Bronze Age Civilisation?
There are few characteristics of Bronze age, first and foremost is the use of metal tools especially copper and its alloys, secondly we see rise of organized settlements and early evidence of written scripts.
Now when we look into harappan settlements we find that:
1. There was high usage of metal implements made out of copper and its alloys. for example the famous Dancing girl was made out of bronze and we find that Lothal was one important site where bronze was produced.
2. Harappan civilization was also a highly organized settlements, it was well planned with systematic drainage, streets and housing facilities.
3. There are also evidence of written scripts, unfortunately we are unable to decipher it.
Thus we can see that Harappan civilization was a Bronze age civilization.