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Question

Coal is formed from the remains of


A

Vegetation only

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B

Animals only

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C

Both vegetation and animals

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D

Neither vegetation nor animals

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Solution

The correct option is A

Vegetation only


An explanation for the correct option

(A) Vegetation only

  • Coal is made up of Carbon(C), Hydrogen(H2), Oxygen(O2), Nitrogen(N2), Sulphur(S), moisture, and incombustible mineral matter (i.e., ash).
  • Coal is formed from the remains of plants buried beneath the crust of the earth. Over time, geological actions change the chemical and physical properties of the remains to create a solid material i.e. coal.
  • The energy in coal comes from the energy stored in giant plants, which lived in swamp forests hundreds of millions of years ago.
  • Coal is grey or a brownish-black sedimentary rock ready to be combustible.

An explanation for the incorrect options

  • (B) Animal remains are not converted into coal even over a long period of time.
  • (C) and (D) are not appropriate answers as vegetation only is the correct answer.

Hence, option (A) is correct as coal is formed from the remains of vegetation only.


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