Assess understanding of the global carbon cycle by having students identify major reservoirs (atmosphere, oceans, terrestrial biosphere, sediments/rock), describe and compare key fluxes (photosynthesis, respiration, decomposition, ocean–atmosphere exchange, fossil fuel combustion, sequestration), explain residence times and net flux imbalances, analyze how human activities (fossil fuel burning, land-use change, deforestation, cement production) alter reservoirs and drive climate change, and interpret simple flux/reservoir diagrams and basic net-flux or concentration calculations.