What type of fuel includes roots and peat?

The correct answer pertains to subsurface fuel, which is characterized by its presence below the surface of the ground. This category includes organic materials such as roots and peat that can accumulate beneath the vegetation layer. These materials can play a significant role in fire behavior, particularly in how they can smolder and sustain combustion beneath the forest floor, even when surface conditions appear relatively moist or unburned.

Subsurface fuel is crucial in understanding fire dynamics because it can ignite from a surface fire and may contribute to extended fire duration and the potential for deep-seated fires that can be difficult to detect and manage. Recognizing the characteristics and implications of subsurface fuel helps fire suppression teams make informed strategies regarding fire containment and control efforts, especially in environments where deep-rooted vegetation and organic layers are prevalent.