Edexcel A level Geography Carbon Cycle Final Assessement And Actual Answers 2024.
Carbon Cycle -Answer Largest Carbon Store = Lithosphere/ Sedimentary (100,000,000 PgC) Largest yearly flux = Photosynthesis (103 PgC from Atmosphere 560 to Biosphere 2,060) Smallest Carbon Store = Atmosphere/ Plants (both 560 PgC) Smallest yearly flux = Sedimentation/ fossilisation (0.2 PgC from Deep Oceans 38,000 to Fossil Fuels 4,000) Geological carbon formation -Answer 1. Coal = duration and heat intensity influences %C 2. Limestone = compaction/cementing of shells 3. Crude Oil = chemical decomposition of dead phytoplankton Geological processes that release carbon -Answer Outgassing and Partial melting of sedimentary rocks Outgassing -Answer Release of CO2 in crust by volcanic eruptions/earthquake activity (geysers/ hot springs) Geological carbon cycle -Answer Slow (10-100 million tonnes carbon/year) , huge carbon store Anthropological carbon cycle -Answer Human caused, fast (1,000 million tonnes carbon/year) Biological carbon cycle -Answer Fast (10,000-100,000 million tonnes carbon/year), flows and sequester between oceans, vegetation and freshwater Phytoplankton -Answer Carry out photosynthesis by taking out carbon from seawater which enables more carbon to enter the sea (1,000 x more than respiration)
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