Wildland Firefighting Practice Exam

What shape does fire typically drive upward in when on a steep slope?

1. Circle

2. Square

3. Pyramid

4. Wedge

The correct answer is: Wedge

Fire on a steep slope typically exhibits a wedge shape as it moves upward. When a fire burns on a slope, the heat and flames rise, driven by the characteristics of fire behavior. The heat generates convective currents, which draw in cooler air from the sides and beneath, effectively creating a triangular or wedge-like profile. This shape facilitates the upward movement of flames and smoke, helping the fire to gain intensity and spread more rapidly in the direction of the slope. The wedge shape is also influenced by the fuel available on the slope, as it can create a funneling effect that directs the fire upward. Understanding this behavior is crucial for firefighters, as it helps in predicting fire spread and planning effective suppression strategies.