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A geologist describes how coal was formed when organic materials piled up in swamps ... up in swamps millions of years ago. Over time, ... As long as it is ...
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coal mining Jun 14, 2016 The mining of coal from surface and underground deposits today is a highly funeral pyres during the Bronze Age, 3,000 to 4,000 years ago, in ...
Mining is the extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits.
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