Q. Which among the following is/are the raw materials in the cement industry?
  1. Clay
  2. Gypsum
  3. Limestone 
  4. Coal
Select the correct code from the options given below:

Answer: 1, 2, 3 & 4
Notes: The word cement means the Portland cement that has brought about a revolution in building and other construction works. The raw materials of the cement industry are limestone, clay, gypsum and coal.

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