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  • Coal - Wikipedia
    Coal is a mixture of diverse organic compounds and polymers Several kinds exist, with variable dark colors and composition Young coals (brown coal, lignite) are not completely black The two main black coals are bituminous, which is more abundant, and anthracite
  • Coal | Uses, Types, Pollution, Facts | Britannica
    coal, one of the most important primary fossil fuels, a solid carbon -rich material that is usually brown or black and most often occurs in stratified sedimentary deposits coal deposits Location of the most-important coal occurrences on Earth
  • Coal - Education | National Geographic Society
    Coal is a black or brownish-black sedimentary rock that can be burned for fuel and used to generate electricity It is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning)
  • What are the types of coal? | U. S. Geological Survey - USGS. gov
    There are four major types (or “ranks”) of coal Rank refers to steps in a slow, natural process called “coalification,” during which buried plant matter changes into an ever denser, drier, more carbon-rich, and harder material The four ranks are: Anthracite: The highest rank of coal
  • COAL Definition Meaning - Merriam-Webster
    : a black or brownish-black solid combustible substance formed by the partial decomposition of vegetable matter without free access of air and under the influence of moisture and often increased pressure and temperature that is widely used as a natural fuel coals plural, British : pieces or a quantity of the fuel broken up for burning
  • How does coal form? - Live Science
    By studying how coal forms, scientists can learn both about the deep past and about what to expect when different coals burn Coal forms when swamp plants are buried, compacted and heated
  • Coal explained - U. S. Energy Information Administration (EIA)
    Coal is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons Coal is classified as a nonrenewable energy source because it takes millions of years to form Coal contains the energy stored by plants that lived hundreds of millions of years ago in swampy forests





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