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Coal is a fossil fuel formed in ecosystems where plant remains were saved by water and mud from oxidization and biodegradation. Coal is a readily combustible black or brownish-black rock. It is a sedimentary rock, but the harder forms, such as anthracite coal, can be regarded as metamorphic rocks because of later exposure to elevated temperature...

  • Coal
  • Coal Liquefaction
  • Fuels
  • Natural Gas
  • World
  • Electricity Generation
  • Fuel Production