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Question
Number the points.
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Solution
1. Storage of energy from sun in coal and petroleum
2. Deposit of bulk supplies 200-600 million years ago
3. Abundance of microscopic forms of life in tropical conditions
4. Death of microscopic life forms leading to recycling through decay
5. Prevention of total decomposition by significant amount of dead plants and animals being covered with mud
6. Hardening of sediments, over the years, led to rock-formation
7. Production of coal, petroleum by compression of matter between rocks
8. Unsuitability of present-day conditions for coal-formation
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