earthspheresSancXi

media type="file" key="6 Sanchez Earth's Spheres.swf" width="360" height="270"

Earth's spheres have things in common that make them tie together. For example,all the spheres are in the geosphere(the earth). The spheres all need each other. The biosphere needs the hydrosphere to survive. The cryosphere also needs the hydrosphere(or the water) in order to have ice. All spheres use each other. Without each other, some spheres would not exist.