The idea is to increase the distance between trees to prevent the so-called " crown fires, " which are virtually impossible for firefighters to put out.
22.
Not only would the forests be restored and the possibility of crown fires be lessened, but a new market niche in the Southwest could be created.
23.
The firestorm extended to the north, growing in intensity to become an aerial or crown fire, a fierce conflagration that consumes fuel from the forest's canopy.
24.
Also, if fire is suppressed for a number of years and then a crown fire breaks out in the area, it will quickly spread throughout the dense canopy.
25.
It's exactly those kind of hot-burning crown fires _ where the flames rapidly jump from one treetop to the next _ that Grand Canyon officials desperatelywant to avoid.
26.
He found the homes hadn't been ignited by crown fires, but by flying firebrands landing on flammable roofs or flames creeping through dense mats of dry pine needles.
27.
Piles of brush and deadfall accumulate, creating a fire ladder which carries flames to the top of the tall pines, erupting into dreaded crown fires, as occurred near Bandelier.
28.
It spreads quickly through the underbrush and climbs lower trees like ladders to reach the vulnerable tops of the tall ponderosas-- the so-called crown fires of massive fury and destruction.
29.
It spreads quickly through the underbrush and climbs lower trees like ladders to reach the vulnerable tops of the tall ponderosas _ creating so-called crown fires of massive fury and destruction.
30.
In higher elevations, dense forests with a mix of pines, firs and spruces have always been the norm, biologists say, and occasional crown fires in these regions are actually considered natural.
