Which of the following is NOT a factor in wildfire spread?

Wet soil conditions are not a factor in the spread of wildfires because moisture in the soil contributes to healthier plant growth. When the soil is wet, it generally promotes robust vegetation that can act as a barrier to fire spread, as the presence of moisture within plant material makes it less likely to ignite compared to dry conditions. In contrast, high winds can amplify the rate of fire spread by carrying embers over larger distances, dry vegetation serves as highly combustible fuel, and steep terrain can influence the movement of flames and heat, allowing fires to spread more rapidly uphill. Therefore, wet soil conditions do not contribute to fire spread and can instead act as a natural suppressive factor.