After you have finished check with the notes given below.
Storage of energy from sun in coal and petroleum
• Deposit of bulk of supplies 200 - 600 million years ago
• Teeming life in tropical conditions
Death of life forms, leading to recycling through decay
Prevention of total decomposition by considerable dead
plants, animals being covered with mud
Solidification of sediment leading to rock-formation
over time
Production of coal, petroleum by compression of organic
matter between rocks
Unsuitability of present-day conditions for coal-formation
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