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What types of coal crumble on exposure to the air?

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Lignite and subbituminous coal, because of the high percentage of moisture they contain, tend to crumble on exposure to the air ...

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Similar questions: Why does lignite crumble when exposed to air? Does subbituminous crumble when exposed to the air? Can lignite coal remain solid when it comes in contact with air? What do lignite and subbitumious coal have in common? [ Hide these questions ]

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