Coal - Wikipedia
Coal is a type of fossil fuel, formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years. [2]
What is coal? | U.S. Geological Survey - USGS.gov
Coal is a sedimentary deposit composed predominantly of carbon that is readily combustible. Coal is black or brownish-black, and has a composition that (including inherent moisture) consists of more than 50 percent by weight and more than 70 percent by volume of carbonaceous material.
Coal | Uses, Types, Pollution, & Facts | Britannica
2025年1月17日 · Coal is an abundant natural resource that can be used as a source of energy, as a chemical source from which numerous synthetic compounds (e.g., dyes, oils, waxes, pharmaceuticals, and pesticides) can be derived, and in the …
Coal - National Geographic Society
2024年11月15日 · Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity. Mining techniques and combustion are both dangerous to miners and hazardous to the environment; however, coal accounts for about half of the …
Coal - World Distribution, Fossil Fuel, Energy | Britannica
2025年1月17日 · Coal is a widespread resource of energy and chemicals. Although terrestrial plants necessary for the development of coal did not become abundant until Carboniferous time (358.9 million to 298.9 million years ago), large sedimentary basins containing rocks of Carboniferous age and younger are known on virtually every continent , including ...
Coal explained - U.S. Energy Information Administration (EIA)
2023年10月24日 · 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.
Coal explained Coal and the environment - U.S. Energy …
2024年4月17日 · Coal is an abundant fuel source that is relatively inexpensive to produce and convert to useful energy. However, producing and using coal affects the environment. Surface mines (sometimes called strip mines) were the source of about 63% of the coal mined in the United States in 2022.
Coal: A Complex Natural Resource - USGS Publications Warehouse
Determining the organic matter in coal is necessary for studying (1) the organic structure and the organic sulfur compounds in coal, (2) modern peat-forming swamps as analogues of ancient peat-forming swamps, (3) the potential for coal gasification and liquefaction, and (4) the effects of coal mining and coal use on surface water, ground water ...
Coal - Understand Energy Learning Hub
Coal is the most carbon-intensive fossil fuel and a huge contributor to climate change, air pollution, and land disruption. It is a chemically complex, rock-like hydrocarbon that contains heavy metals (e.g., mercury and lead), sulfur, and radioactive material. Coal is mined from the Earth and burned to convert chemical energy to heat.
Coal Basics | American Geosciences Institute
Web overview of how coal was formed, types of coal, coal production (mining, processing, and transporting), where U.S. coal comes from, imports and exports, how much coal is left, uses of coal, prices and price outlook, and environmental impacts of coal.
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