How is coal formed?
Graduate from Queen Mary University of London.
Coal was formed from dead plants about 300 million years ago. Back then, much of the Earth was covered by swamps. As the vegetation died, it decayed, slowly forming layers of peat. Over time this was covered with more sediment and compressed and heated to form coal. Reference: http://www.bbc.co.uk/bitesize/ks3/geography/human_processes/sustainable_futures/revision/3/
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