The percentage scientists estimate wild fires contribute to global carbon emissions
5-10
1 of 10
Why are wild fires starting to play a bigger role in changing the cycle and stores of carbon across the planet?
more wildfires = more CO2 returned to the atmosphere by combustion.
more wildfire = death of forests = less CO2 being taken out of the atmosphere by photosynthesis.
2 of 10
How does volcanic activity cause CO2 to be returned to the atmosphere.
2 continental plates collide, one sinking under the other.
The rocks melt under the heat and pressure.
The rocks combine into silicate minerals releasing CO2.
3 of 10
How many Gigatonnes of carbon does burning hydro carbons (fossil fuels) release?
21
4 of 10
Name 4 ways in which land use change can result in changes in the carbon store.
conversion of natural ecosystems to:
crop land
pasture
Abandonment of croplands and pastures
deforestation
wetland clearance
afforestation
5 of 10
How does wetland clearance lead to carbon returned to the atmosphere?
when the water is drained the soil becomes exposed to oxygen.
The carbon is usually resistant to decay under the anaerobic conditions found in wetland soils.
The exposure to oxygen can lead to carbon being lost by aerobic respiration.
6 of 10
Name to ways in which urbanisation can impact the local carbon cycle.
stores are replaced - vegetation being removed to make room for infrastructure
stores are covered up - soils are covered by impermeable surfaces
7 of 10
The region in which deforestation is most prevelant.
the tropics
8 of 10
Deforestation accounts for --% of global carbon emissions
20
9 of 10
Name all factors driving change in the carbon cycle.
volcanic activity
wildfires
urbanisation
deforestation
land use changes
wetland clearance
10 of 10
Other cards in this set
Card 2
Front
Why are wild fires starting to play a bigger role in changing the cycle and stores of carbon across the planet?
Back
more wildfires = more CO2 returned to the atmosphere by combustion.
more wildfire = death of forests = less CO2 being taken out of the atmosphere by photosynthesis.
Card 3
Front
How does volcanic activity cause CO2 to be returned to the atmosphere.
Back
Card 4
Front
How many Gigatonnes of carbon does burning hydro carbons (fossil fuels) release?
Back
Card 5
Front
Name 4 ways in which land use change can result in changes in the carbon store.
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