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Coal is a sedimentary organic rock formed primarily from the remains of ancient vegetation subjected to physical and chemical changes over millions of years under conditions of high pressure and temperature. The origin of coal can be traced back to the Carboniferous period in some parts of the world, but in India, most coal deposits were formed during the Gondwana period, approximately 250 to 300 million years ago, and some Tertiary coals formed during the Eocene to Miocene epochs. The ____ ___ ________ ________ ____ ____ __________ ___ _______ ______.
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