Coal-seam fire

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What Wikipedia says

A coal-seam fire is a burning of an outcrop or underground coal seam. Most coal-seam fires exhibit smoldering combustion, particularly underground coal-seam fires, because of limited atmospheric oxygen availability. Coal-seam fire instances on Earth date back several million years.

Excerpt from the Wikipedia article “Coal-seam fire”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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