What term describes the portion of a wildfire that advances most rapidly?

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Multiple Choice

What term describes the portion of a wildfire that advances most rapidly?

Explanation:
The fastest-moving portion of a wildfire is the head—the leading edge that pushes outward ahead of the rest. The head moves quickly because wind and slope drive flames into unburned fuels, and the heat preheats those fuels ahead, accelerating spread. The back (or heel) burns toward the wind and tends to advance much more slowly, while the edge is simply the boundary between burned and unburned areas. Rim isn’t a standard term for describing the fastest-moving part.

The fastest-moving portion of a wildfire is the head—the leading edge that pushes outward ahead of the rest. The head moves quickly because wind and slope drive flames into unburned fuels, and the heat preheats those fuels ahead, accelerating spread. The back (or heel) burns toward the wind and tends to advance much more slowly, while the edge is simply the boundary between burned and unburned areas. Rim isn’t a standard term for describing the fastest-moving part.

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