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The origin of coal

Much of the coal on Earth was formed 300 million years ago, during the Carboniferous period. The coal was formed where the climate was hot and humid, and there were extensive areas covered in lush vegetation that grew in swamps. When the plants died, the remains accumulated at the bottom of the swamps. After this, they were covered by a layer of clay and gravel, which prevented the flow of oxygen. [...]

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