Multiple choice

Why are coal and petroleum called fossil fuels?

  1. Because they are formed from dead remains of living organisms.

  2. Because they are very good fuels and their calorific value is very high.

  3. Because they are widely used in houses, industries and in vehicles also.

  4. Because they take millions of year for formation and are formed inside the earth.

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A Correct answer
Explanation

Fossil fuels are the fuels, which are formed due to the decay of dead plants and animal remains. This process takes millions of years. Coal and petroleum are formed in nature with the same process. So, they are known as fossil fuels. 

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