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In page Peat:

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Peat has a high carbon content and can burn under low moisture conditions. Once ignited by the presence of a heat source (e.g., a wildfire penetrating the subsurface), it smoulders. These smouldering fires can burn undetected for very long periods of time (months, years,[2] and even centuries[citation needed]) propagating in a creeping fashion through the underground peat layer.