In GC II 8, Aristotle shows that earth, water, air, and fire, are presented in every mixed body. Here Aristotle develops further the discussion of elemental mixtures started in GC II 7. He goes beyond anything done up to this point because the mixed bodies he is concerned with are not just the elemental mixtures discussed in GC II 7; rather, they are all the mixed bodies inhabiting the region around the center of the universe. Insofar as this region is the place where the natural processes of generation and corruption take place, GC II 8 prepares the grounds for the final section of the GC II (GC II 9-11).