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Alternative raw materials such as steel slag or foundry sand are attractive chiefly because they

  • A.divert waste from landfill and reduce quarrying
  • B.make the kiln run at a very much lower temperature
  • C.eliminate the need for any limestone in the mix at all
  • D.remove all of the emissions from the cement-making process

Answer: A

They substitute for material that would otherwise be dug, and they give a use to something that would otherwise be discarded. Their composition has to be checked carefully, since waste streams vary far more than quarried stone does.

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