Word: fuel
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...Fuel means flammable solids--grass, pine needles, undergrowth, smaller trees--that, with oxygen, feed the fire...
...FUEL It's a dangerous recipe: decades of fighting every forest fire have left many areas dangerously full of fuel--sticks, fallen timber, pine needles and brush. This year's drought has sapped the natural moisture from the ground...
...Then cooler air rushes in to fill the void --Fresh air rushes in, bringing more oxygen to fuel the flames...
...This convection system creates gale-force hot winds that dry out and preheat fuel ahead of the fire and can propel burning embers as much as half a mile (0.8 km) --Blowing embers allow the fire to jump natural barriers such as rivers and valleys...
UPHILL BATTLE Wildfires charge rapidly up mountainsides because the heat from the fire rises and is directed at the fuel uphill, drying it out before the flames arrive...