S 190 PRACTICE SOLUTION STUDY SHEET
QUESTIONS AND DETAILED ANSWERS
●● NIFC
Answer: National Interagency fire center
●● Point of origin
Answer: The precise location where a competent ignition source came
into contact with the material first ignited and sustained combustion
occurred.
●● Head of a fire
Answer: The side of the fire having the fastest rate of spread.
●● Flank of a fire
Answer: The part of a fire's perimeter that is roughly parallel to the main
direction of spread.
●● Rear of a fire
Answer: That portion of a fire spreading directly into the wind or down
slope.
That portion of fire edge opposite the head.
Slowest spreading portion of a fire edge. Also called heel of a fire.
,●● Fire Perimeter
Answer: The entire outer edge or boundary of a fire.
●● Fingers of a fire
Answer: The long narrow extension of a fire projecting from the main
body
●● Pockets of a fire
Answer: Unburned indentations in the fire edge formed by fingers or
slow burning areas
●● Island
Answer: Area of unburned fuel inside the fire perimeter
●● Spot fire
Answer: Fire ignited outside the perimeter of the main fire by a fire
brand
●● Smoldering
Answer: Fire burning without flame and barely spreading
●● Creeping fire
, Answer: Fire burning with a low flame and spreading slowly
●● Running fire
Answer: Behavior of a fire spreading rapidly with a well defined head
●● Spotting
Answer: behavior of a fire producing sparks or embers that are carried
by the wind and which start new fires beyond the zone of direct ignition
by the main fire.
●● Torching
Answer: The burning of the foliage of a single tree or a small group of
trees, from the bottom up.
●● Crown fire
Answer: A fire that advances from top to top of trees or shrubs more or
less independent of a surface fire. Crown fires are sometimes classed as
running or dependent to distinguish the degree of independence from the
surface fire.
●● Flare up
Answer: Any sudden acceleration in the rate of spread or intensification
of the fire. Unlike blowup, a flare-up is of relatively short duration and
does not change existing control plans.
QUESTIONS AND DETAILED ANSWERS
●● NIFC
Answer: National Interagency fire center
●● Point of origin
Answer: The precise location where a competent ignition source came
into contact with the material first ignited and sustained combustion
occurred.
●● Head of a fire
Answer: The side of the fire having the fastest rate of spread.
●● Flank of a fire
Answer: The part of a fire's perimeter that is roughly parallel to the main
direction of spread.
●● Rear of a fire
Answer: That portion of a fire spreading directly into the wind or down
slope.
That portion of fire edge opposite the head.
Slowest spreading portion of a fire edge. Also called heel of a fire.
,●● Fire Perimeter
Answer: The entire outer edge or boundary of a fire.
●● Fingers of a fire
Answer: The long narrow extension of a fire projecting from the main
body
●● Pockets of a fire
Answer: Unburned indentations in the fire edge formed by fingers or
slow burning areas
●● Island
Answer: Area of unburned fuel inside the fire perimeter
●● Spot fire
Answer: Fire ignited outside the perimeter of the main fire by a fire
brand
●● Smoldering
Answer: Fire burning without flame and barely spreading
●● Creeping fire
, Answer: Fire burning with a low flame and spreading slowly
●● Running fire
Answer: Behavior of a fire spreading rapidly with a well defined head
●● Spotting
Answer: behavior of a fire producing sparks or embers that are carried
by the wind and which start new fires beyond the zone of direct ignition
by the main fire.
●● Torching
Answer: The burning of the foliage of a single tree or a small group of
trees, from the bottom up.
●● Crown fire
Answer: A fire that advances from top to top of trees or shrubs more or
less independent of a surface fire. Crown fires are sometimes classed as
running or dependent to distinguish the degree of independence from the
surface fire.
●● Flare up
Answer: Any sudden acceleration in the rate of spread or intensification
of the fire. Unlike blowup, a flare-up is of relatively short duration and
does not change existing control plans.
