Discussion
Forest fire spreading slowly over the ground with low flame is
Answer: D
The key's term for a slow, low-flame fire over the ground is creeping fire.
Forest fires are classed by where they burn. A crown fire races through the canopy; a ground fire smoulders below the surface in humus and peat with little or no flame; a surface fire burns the litter and undergrowth on the forest floor. A surface fire that spreads slowly with low flames, typically on a calm day or in light fuel, is called a creeping fire.
'Surface fire' is the broader class to which a creeping fire belongs, but the question describes the slow, low-flame form specifically, which is the creeping fire. A crown fire is fast and high, and a ground fire is flameless and below the surface.
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