Fire Line Fire break built around a fire either with use of tractor-plow machinery or with hand tools. Fire lines may also be roads, plowed fields, streams and wet, swampy areas which will resist fire. The period or periods of the year during which fires are most likely to occur, spread and do sufficient damage to warrant organized fire control. The sides of a fire. Fuels Dry grasses, leaves, twigs, needles, shrubs or trees easily consumed by fire.
More fuels cause a fire to burn faster and more intensely.
Burning organic soil which sometimes burns several inches to several feet under ground. Ground Fires are often difficult to detect and can burn for extended periods of time. The portion of a forest fire spreading the fastest. Unless lives or property are threatened, firefighter's primary concern is stopping the head fire. The head can change direction depending on wind, making it particularly dangerous to work on directly.