7. Carbon Cycle to spec

A Level Environmental Science revision

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Last updated: May 17, 2025

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Hint	Answer
Lithospheric	Carbonate rocks
Lithospheric	Fossil fuels
Lithospheric	Pure carbon
Hydrospheric	Dissolved CO2
Hydrospheric	Carbonate ions
Atmospheric	Gasous carbon
Biospheric	Organic matter
Biospheric	Biomolecules
Crysospheric (5 words)	Dead organic matter in permafrost
Main processes	Photosynthesis
Main processes	Respiration
Main processes	Complex food webs
Main processes	Fossilisation
Main processes	Combustion
Photosynthesis: __________ captures ____ _______ to convert low-energy substances into ___-______ ____________	Chlorophyll, light energy, high energy carbohydrates
Respiration: ______ captured during photosynthesis is used to ____ _________ _________	Energy, drive metabolic processes
Decomposer example (2)	Bacteria, fungi
Detritivore example (2)	Beetles, earthworms
Fossilisation (5 words)	Incomplete anaerobic decomposition and compression
Fossilisation (6 words)	Calcifying marine life die and lithify
Human activities	Photosynthesis changes
Human activities	Respiration
Human activities	GHGs
Human activities	Biomass movement
Human activities	Dissolved CO2
Human activities	Carbonic acid
Human influences on photosynthesis	Deforestation
Human influences on photosynthesis	Afforestation

Hint	Answer
Human influences on photosynthesis	Marine pollution
How marine pollution affects photosynthesis	Reduces phytoplankton
How marine pollution affects photosynthesis	Reduces sequestration
Human influences on aerobic respiration	Ploughing
Human influences on anaerobic respiration	Rice padi fields
Human influences on anaerobic respiration	Landfill sites
Human influences on anaerobic respiration	Livestock intestines
Human influences on biomass movement	Deforestation
Human influences on biomass movement	Crop harvesting
Human influences on biomass movement	Composting
Human influences on biomass movement	Sewage discharge
Current carbonic acid	Equilibrium with dissolved CO2
Increased __________ CO2 = increased _______ CO2 = increased _________ ____ = increased _________ ___ = _____ ______________	Atmospheric, dissolved, carbonic acid, hydrogen ions, ocean acidification
Sustainable management	Alternative energy sources
Sustainable management	Carbon sequestration
Sustainable management	Carbon Capture Storage
Sustainable management	Afforestation matching
Sustainable management	Soil organic matter
Sustainable management	Peat bog conservation
Pre-combustion CCS	Gasification
Pre-combustion CCS	Oxy-fuel combustion
Post-combustion CCS	Graphene adsorption
Post-combustion CCS	High pressure membrane filtration
Gasification: converts fuel to ______ _________ and CO2, releasing only _____ ________ when burnt	Gaseous hydrogen, water vapour
Oxy-fuel combustion: Combustion with ____ _______, so only CO2 and _____ ________ are released	Pure oxygen, water vapour
CCS storage	Aquifers
CCS storage	Oil fields
CCS storage	Secondary oil recovery

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