For AS Environmental Studies/ Science (Lithosphere) and also new A'level Geography Specification (Carbon Cycle focus) The different states of the biogeochemical cycles: atmospheric, biological, hydrological, lithosphere For each cycle the processes and stores; with impacts humans have on the natural dynamic equilibrium between these factors. Further student research on the Gaia Theory and also past AQA Environmental summary questions at the end of each cycle. Accompanying power-point with answers for handout