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Which of the following statements about minerals are correct? (A) Minerals are created by natural processes without any human interference (B) Mica and chromite are nonferrous minerals (C) Minerals lying at shallow depths are taken out through open cast mining (D) Minerals are a non-renewable resource

Which of the following statements about minerals are correct? (A) Minerals are created by natural processes without any human interference (B) Mica and chromite are nonferrous minerals (C) Minerals lying at shallow depths are taken out through open cast mining (D) Minerals are a non-renewable resource Correct Answer A, C and D

A naturally occurring substance that has a definite chemical composition is a mineral.Important Points

  • Minerals are formed in different types of geological environments, under varying conditions
  • They are created by natural processes without any human interference.
  • They can be identified on the basis of their physical properties such as colour, density, hardness and chemical property such as solubility.
  • on the basis of composition, minerals are classified mainly as metallic and non-metallic minerals.
  • Metallic minerals contain metal in raw form. Metals are hard substances that conduct heat and electricity and have a characteristic lustre or shine. Iron ore, bauxite, manganese ore
    • Metallic minerals may be ferrous or non-ferrous.
    •  Ferrous minerals like iron ore, manganese and chromite contain iron
    • A non-ferrous mineral does not contain iron but may contain some other metal such as gold, silver, copper or lead.
  • Non-metallic minerals do not contain metals. Limestone, mica and gypsum are examples of such minerals. The mineral fuels like coal and petroleum are also non-metallic minerals.
  • Minerals can be extracted by mining, drilling or quarrying.
  • Minerals are considered nonrenewable because they take a very long time to form (millions of years). This implies that once they are used up, they cannot get back within a short period.
  • The process of taking out minerals from rocks buried under the earth’s surface is called mining. Minerals that lie at shallow depths are taken out by removing the surface layer; this is known as open-cast mining.
  • Minerals occur in different types of rocks. Some are found in igneous rocks, some in metamorphic rocks while others occur in sedimentary rocks.

 So, above points shows that A,C,D satisfy the minerals.

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