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Q6. What is coke ? How is it obtained ?
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Q7. Differentiate between exhaustible and inexhaustible natural resources.
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Q8. What is natural gas?
        Why is it called a clean fuel ?
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Q9. Anthracite is considered the best variety of coal. Explain.
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Q10. Why are coal and petroleum called fossil fuels ?
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Shot - Answer Questions (Type II) : Answer in about 30- 40 words.
1. What is meant by " Energy Crisis" ? 
    How can it be prevented ?
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10.  Coal and petroleum are called fossil fuels because they are made from the dead vegetation and dead marine organisms respectively. They take millions of years to form and this conversion  is a very slow process.
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