Multiple choice

Which of the following substances is a fossil fuel?

  1. Wood

  2. Coal

  3. Biogas

  4. Water gas
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Coal was formed from the trees (fossils) that got buried under the layers of the earth during natural calamities like earthquake etc. Under geothermal conditions of high temperature and pressure, wood is converted into coal. 

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