Wildland Firefighting Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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Question: 1 / 400

The degree of exposure to solar rays on a slope is determined by what?

Temperature

Humidity

Steepness of the slope

The degree of exposure to solar rays on a slope is primarily influenced by the steepness of that slope. Steeper slopes tend to receive more direct sunlight than flatter areas because the angle of incidence changes. This means solar energy can hit the surface more perpendicularly, leading to higher levels of exposure. Understanding this principle is essential for wildland firefighting, as it affects fire behavior, the drying rate of vegetation, and the overall risk of fire spread.

The other factors, while they may have some influence on fire behavior and vegetation growth, do not directly impact the exposure of the slope to sunlight as significantly as the steepness. Temperature and humidity may affect moisture content in vegetation, while the type of vegetation can influence fuel loads and fire potential, but the slope’s angle is the key determinant in how much solar radiation is received.

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Type of vegetation

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