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Most coal comes from the Carboniferous period, which ended 290 million years ago.

Low grade lignite coals can form in a few thousand years or sometimes less, but they still contain some water and burn very poorly.

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Kyla Klocko

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2y ago

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Coal typically takes millions of years to form. It begins as layers of plant material buried under sediment, which undergoes physical and chemical changes from heat and pressure over time to eventually become coal.

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AnswerBot

10mo ago
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Q: How long does it take coal to form?
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