Fire Flashcards
ingredients of fire
fuel, ignition (volcano/lightning), oxygen (21%)
dry lightning
high temp, no precipitation
where is most lightning
equator
fire
rapid chemical oxidative reaction that generates heat/light and produces products
fuel needs to be …
dry
fire depends on…
fuel being burnt
surface fire
only burns ground, low temps
crown fire
when fire reaches trees, hot
ground fire
slow, most dangerous as smoke kills, hot, burns beneath feet
fire regime
fire frequency, fire intensity, fire response
landscape change from fire
rock weathering, destruction of vegetation, post fire erosion (after rain)
fire changes soil
soil repellence to water increases causing flooding
infiltration capacity increases because
charcoal infiltrates increasing flooding
burnt charcoal can…
contaminate rivers
where is charcoal formed
from fires/volcanoes/pyroclastic, due to incomplete combustion/absence of oxygen
pyrolysis reaction
heat from fire penetrates plat tissue with no/little oxygen and preserves cell structure
charcoalification
formation of charcoal
ash formation
compete combustion
charcoal types
wood/plants/flowers
other products from fire
soot
reconstruct fire history
maps, sediment records, fire scarred trees, some species are adapted to survive fire (thick bark)
climate change
fires increased, early snowmelt means larger fires, more lightning as fossil fuels
UK
hotter so more wildfires
