what are various varieties of coal ?
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https://www.usgs.gov/faqs/what-are-types-coalhttps://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 […]
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which resource is renewable coal ?
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https://www.nationalgeographic.org › encyclopedia › coalhttps://www.nationalgeographic.org › encyclopedia › coal Coal – National Geographic Society 19 oct. 2023ARTICLE Coal Coal Coal is a nonrenewable fossil fuel […]
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