• Lithosphere – Sedimentary rocks (99.9%) and fossil fuels.
• Hydrosphere – Oceans
Surface layer phytoplankton photosynthesis and diffusion
Intermediate and deep layer marine food chains and sea floor sediments
Calcium carbonate shells
• Terrestrial/biosphere organic matter
• Atmosphere as a ‘trace gas’ however its importance is based on it being a potent
greenhouse gas.