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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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.
Coal typically takes millions of years to form. It is created through the transformation of plant material under high pressure and heat over prolonged periods of time.
It typically takes millions of years for coal to form. Coal is created from the remains of plants and trees that were buried under layers of sediment and subjected to heat and pressure over long periods of time.
Diamonds. Under extreme pressure and temperature, carbon atoms in coal can rearrange to form diamonds.
Coal typically takes millions of years to form from decomposed plant material that has been subject to heat and pressure. The process involves several stages, starting with peat formation and eventually transforming into coal over time.
Carbon in coal is oxidized to form carbon dioxide gas when coal is burned.