T/F Topography can directly and indirectly affect fuels and their availability for combustion. - correct-answersTrue Of the three primary environmental factors that influence fire behavior, which is the least variable? - correct-answersTopography

S-290 CORRECT ANWERS 2025
 T/F Topography can directly and indirectly affect fuels and their availability for
combustion. - correct-answersTrue

 Of the three primary environmental factors that influence fire behavior, which is the least
variable? - correct-answersTopography

 The least critical form of heat transfer that influences rate of spread in a running wild
land fire is: - correct-answersConduction

 The point to which a combustible material must be heated to produce self-sustaining
combustion is known as the: - correct-answersIgnition temperature

 Fireline intensity is dependent upon: - correct-answersAll of the above.
 Fuel size
 Fuel moisture
 Fuel temperature
 Fuel compactness and arrangement

 T/F Two requirements for long range spotting are wind and a well developed convection
column. - correct-answersTrue

 A fire that advances through canopies of brush and trees is known as a: - correct-
answersCrown fire

 Fire is burning in litter on top of the ground, but occasionally carries into the crowns of
individual trees, which produces burning embers that start new fires outside the fire
perimeter. - correct-answersSurface fire with torching and spotting.

 Fire begins burning into the crowns and spreads through the canopy. There is a sudden
increase in fireline intensity where the fire controls it's environment. At one point flames
can be seen carried high into the convection column with a whirling motion. - correct-
answersGround fire with smoldering and flare ups.

 T/F Upward moving air contracts and warms. - correct-answersFalse

 As air sinks, it. - correct-answersIncreases in pressure, warms and compresses.

 Why do dry climates usually have lower nighttime temperatures than humid climates? -
correct-answersBecause there is less water vapor in the air to absorb and reflect
heat back to the surface at night.

,  T/F On average the RH doubles with each 20F decrease of temperature, or halves with
each 20F increase in temperature. - correct-answersTrue

 T/F The lowest RH occurs with the highest temperature. - correct-answersTrue

 T/F RH is usually lower on north aspects. - correct-answersFalse

 T/F Cloudiness has little affect on relative humidity and temperature. - correct-
answersFalse

 T/F The type of vegetation has little affect on temperature and humidity. - correct-
answersFalse

 T/F RH measures the amount of moisture in the air. - correct-answersTrue

 S/U Clouds form in layers. - correct-answersStable

 S/U Gusty winds - correct-answers Unstable

 S/U Smoke column spreads out after limited rise. - correct-answersStable

 S/U Clouds grow vertically - correct-answersUnstable

 S/U Firebrands are lifted into convection column. - correct-answersUnstable

 T/F Temperature decreases with an increase in elevation when an inversion is present. -
correct-answersFalse

 What is the general effect of stable air on wild land fires? - correct-answersFire activity
decreases

 What conditions will occur under a surface inversion during the morning hours? -
correct-answersAll of the above
 Temperatures are cool, winds are calm or light
 Fire activity is decreased
 Pollutants can accumulate under inversions

 What are the different lighting processes that can lead to thunderstorm development? -
correct-answersFrontal, orographic, thermal, convergence

 T/F Unstable air can often be found in low pressure systems and on the leading edge of
cold fronts. - correct-answersTrue

 T/F Unstable air can be formed by either heating the air near the ground or by cooling the
air aloft. - correct-answersTrue