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Coal, petroleum and natural gas are called fossil fuels because they formed from:

AMeteor dust
BDead organisms
CVolcanic rocks
DSea salt beds
Answer & Solution
Correct answer: B. Dead organisms
1. They took millions of years to form. 2. Dead remains of living organisms became fuel. 3. They cannot be made in a laboratory. _Source: syllabus Science, Chapter 5, Coal and Petroleum._
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