Carbon Stores, Transfers and Sequestration
Explaining carbon cycling across terrestrial, oceanic, atmospheric and geological stores from seconds to millions of years.
How to study A-level Geography
Frame the issue by place, space and scale, explain the operating processes, interrogate evidence, compare players and contexts, then reach a qualified judgement.
Core concepts
Concept 1
Major carbon stores include rocks and sediments, oceans, soils, vegetation, fossil fuels and the atmosphere.
Exam cue: Compare both the size and turnover rate of stores.
Concept 2
Photosynthesis, respiration, decomposition, combustion, weathering and ocean exchange move carbon at different rates.
Exam cue: Distinguish a flux rate from the amount already stored.
Concept 3
Sequestration removes carbon from the atmosphere into biological, oceanic or geological stores for differing durations.
Exam cue: Trace how land-use or energy change alters more than one pathway.
Risk pitfalls and guardrails
Assuming the atmosphere is the largest carbon store.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Calling every uptake permanent sequestration.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Ignoring slow geological transfers when changing time scale.
Guardrail: Do not replace process explanation with case-study narration, source evaluation with description, or a valid board route with an invented mix of optional themes.
Memory anchors
Carbon Store
A carbon store is a reservoir containing carbon in a particular form.
Carbon Flux
A carbon flux is a rate of transfer between carbon stores.
Sequestration
Carbon sequestration transfers and retains carbon in a store away from the atmosphere.
Photosynthesis
Photosynthesis transfers atmospheric carbon into biomass.
Combustion
Combustion oxidises carbon-containing material and releases carbon dioxide.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which process transfers atmospheric carbon into plant biomass?
Why is sedimentary rock a major long-term carbon store?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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