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apr 14, 2009 - Nya - Chapter 15

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Cement is made through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used in cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.

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Hadyn, Bethany, Jocey, Natasha

ByHoctor
31 Oct 2017
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apr 14, 2009
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~ 16 years ago
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