Which of the following options does define the term Vulcanization?

Options :
  1. It is the science of studying volcanoes.
  2. It is the method to degrade polymers.
  3. It is a process connected with the making of voltaic cells.
  4. It is a process of hardening of rubber by heating it with sulfur.
Answer and Explanation :-

Answer: Option 4

Explanation:

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