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Coal
Formation and Discovery
Overlay: The world has vast quantities of coal still in the ground. It has been used as a fuel since the Bronze Age and is widespread in the world, although the quality coal is not spread evenly.
Coal began as layers of plant matter accumulated at the bottom of a body of water protected from biodegradation and oxidization, usually by mud or acidic water. The wide shallow seas of the Carboniferous period 800 million years ago provided such conditions. This trapped carbon, including absorbed CO2, was in immense peat bogs that were eventually deeply buried by sediments and transformed ...
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