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C2b: Construction Materials

Materials from rocks

Many construction materials are found in rocks in the earth's crust:

  • Iron and aluminium are extracted from rocks called ORES
  • Brick is made by baking clay (extracted from the earth)
  • Glass, concrete and cement are all made from sand and small pieces of rock
  • Limestone is easiest to shape because it's the softest.
  • Granite is the hardest to shape.
  • HT: rocks differ in hardness because of the way they are made:
    • Limestone is sedimentary rock
    • Marble is metamorphic, made from limestone that has been put under heat and pressure, which makes it harder
    • Granite is an igneous rock

Limestone, Cement and Concrete

Limestone and marble are mainly made of calcium carbonate (CaCO…


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