what are various varieties of coal ?

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https://www.usgs.gov/faqs/what-are-types-coal

https://www.usgs.gov/faqs/what-are-types-coal
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.
Data Management
The USGS Data Management Website is organized according to the USGS Scientific Data Lifecycle Model, which describes the stages of data management and how data flow through a research project from start to finish.

https://energycentral.com/news/coal-101-4-types-coal-and-their-uses

https://energycentral.com/news/coal-101-4-types-coal-and-their-uses
Coal 101: The 4 Types of Coal and Their Uses | Energy Central
Investing News Network Coal is a fossil fuel that is, essentially, the altered remains of prehistoric vegetation, as the World Coal Association (WCA) puts it. However, there are a number of different coal types. Coal originally began to form during the Carboniferous period, which took place between 360 and 290 million years ago.

https://www.thoughtco.com / all-types-of-coal-are-not-created-equal-1182543

https://www.thoughtco.com / all-types-of-coal-are-not-created-equal-1182543
The Types of Coal: Composition, Usage, and Energy Value – ThoughtCo
Updated on September 01, 2021 Coal is a sedimentary black or dark brown rock that varies in composition. Some types of coal burn hotter and cleaner, while others contain high moisture content and compounds that contribute to acid rain and other pollution when burned.

https://www.americangeosciences.org/critical-issues/faq/what-are-the-different-types-of-coal

https://www.americangeosciences.org/critical-issues/faq/what-are-the-different-types-of-coal
What are the different types of coal? – アメリカ地球科学協会
Anthracite, or hard coal, contains the highest amount of carbon out of all coal ranks (86%-97%) 1. It has a brittle texture and lustrous sheen. It is used mostly in industrial settings and the metals industry due to its high heat value. Anthracite is rare in the United States, only making up 0.2% of coal production in 2017 2.

https://energyeducation.ca/encyclopedia/Coal_types

https://energyeducation.ca/encyclopedia/Coal_types
Coal types – Energy Education
Different coal types are all minerals and rocks made largely of carbon. This fossil fuel generates ~40% of the world’s electricity and about 25% of the world’s primary energy. However, not all coal used is the same; it comes in different quantity levels of carbon—which dictates the quality of the coal.

https://www.nationalgeographic.org/encyclopedia/coal

https://www.nationalgeographic.org/encyclopedia/coal
Coal – National Geographic Society
19 oct. 2023ARTICLE Coal 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 electricity generation in the United States. Grades 9 – 12 Subjects

https://www.eia.gov/energyexplained/coal

https://www.eia.gov/energyexplained/coal
Coal explained – U.S. Energy Information Administration (EIA)
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce. The rank of a coal deposit is determined by the amount of pressure and heat that acted on the plants over time.

https://investingnews.com/daily/resource-investing/industrial-metals-investing/coal-investing/types-of-coal

https://investingnews.com/daily/resource-investing/industrial-metals-investing/coal-investing/types-of-coal
Coal 101: The 4 Coal Types and Their Uses – Investing News Network
13 oct. 2022Melissa Pistilli Oct. 13, 2022 11:55AM PST Share There are four main coal types. Here’s a look at their characteristics and uses for those interested in coal investing. Found in the Earth’s…

https://en.wikipedia.org/wiki/Coal

https://en.wikipedia.org/wiki/Coal
Coal – Wikipedia
Geology Coal is composed of macerals, minerals and water. [18] Fossils and amber may be found [where?][by whom?] in coal. Formation Example chemical structure of coal The conversion of dead vegetation into coal is called coalification. At various times in the geologic past, the Earth had dense forests [19] in low-lying wetland areas.

https://www.britannica.com/science/coal-fossil-fuel

https://www.britannica.com/science/coal-fossil-fuel
Coal | Uses, Types, Pollution, & Facts | Britannica
Il y a 3 joursDifferent varieties of coal arise because of differences in the kinds of plant material (coal type), degree of coalification (coal rank), and range of impurities (coal grade). lesoutrali bot