Formation of Organic Fuels
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Coal Coal formation occurs in stages over millions of years: Peat - 1st stage (not a form of coal) - %water + %impurities > %carbon - found near Earth’s surface 2. Lignite - 40% carbon - layers of sediments deposited on top of peat causing heat and pressure 3. Bituminous Coal – 85% carbon - more heat and pressure over time 4. Anthracite Coal – 95% carbon - extreme heat and pressure - most expensive
Image sourced from: https://www.youtube.com/watch?v=QBqAtnKMq2k