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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 is defined as having more than 50 percent by weight (or 70 percent by volume) carbonaceous matter produced by the compaction and hardening of altered plant remains—namely, peat deposits
  • 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 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
  • 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
  • WSGS - What is Coal
    Coal is an organic sedimentary rock that is formed from compressed plant matter and debris accumulated in slow-moving bodies of water, such as swamps It is predominantly composed of organic carbon, which makes it energy dense Coal is an important economic deposit used for energy production and industrial applications How Does Coal Form?
  • Coal | Properties, Formation, Occurrence and Uses - Geology Science
    Coal is a non-clastic sedimentary rock They are the fossilized remains of plants and are in flammable black and brownish-black tones Its main element is carbon, but it can also contain different elements such as hydrogen, sulfur and oxygen Unlike coal minerals, it does not have a fixed chemical composition and crystal structure
  • What is coal where is it found? - FutureCoal
    Coal is a fossil fuel, formed from vegetation, which has been consolidated between other rock strata and altered by the combined effects of pressure and heat over millions of years to form coal seams The energy we get from coal today comes from the energy that plants absorbed from the sun millions of years ago
  • Coal: Anthracite, Bituminous, Coke, Pictures, Formation, Uses
    Coal is an organic sedimentary rock that forms from the accumulation and preservation of plant materials, usually in a swamp environment Coal is a combustible rock and, along with oil and natural gas, it is one of the three most important fossil fuels Coal has a wide range of uses; the most important use is for the generation of electricity





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