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Wildfire

QuestionAnswer
What are the three ingredients needed for a fire to start? Fuel, Oxygen, and Heat
Which two parts of the triangle are the most important for starting a wildfire? Heat and Fuel (because oxygen is already abundant in the air)
How do you put out a fire using the fire triangle? Remove one edge: Remove Heat: Spray water. Remove Oxygen: Use a fire extinguisher. Remove Fuel: Bulldoze plants or set a backfire.
What is the approximate split between human-caused and lightning-caused fires in the U.S.? 85% Human-caused vs. 15% Lightning-caused
Which cause actually burns more total land (acres) in the U.S.? (despite starting fewer fires, lightning-caused fires burn over 4.8 million acres compared to 3.6 million for humans)
What is the #1 specific human cause of wildfires? Arson (at 26%)
Does a fire spread faster upslope or downslope? FASTER Upslope. Heat rises and "preheats" the plants above, creating a chimney effect.
How does drought and high heat affect fire spread? FASTER. They dry out vegetation, making it easier to ignite and burn
How does high humidity affect fire spread? SLOWER. Moist air makes it harder for plants to dry out and catch fire
How do winds affect fire spread? FASTER. Winds bring more oxygen, push flames into new fuel, and can carry embers to start new "spot" fires.
What are Downslope Winds (like Santa Anas), and are they dangerous? FASTER. These are very fast, warm, dry winds that descend from mountains, rapidly drying out plants and spreading fire quickly
Created by: user-2027283
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