What does the earth system include

1. Atmosphere
2. Hydrosphere
3. Lithosphere and geosphere
4. Biosphere

These spheres interact by influencing each other and through the biogeochemical cycles and other natural phenomenon that each one of these spheres factors and caused.

For the purposes of this discussion, the geosphere is the part of the Earth's system that includes the earth's interior, rocks and minerals, landforms and the all the processes that shape the earth's surface. The earth is not a perfect sphere. This makes it difficult to calculate the diameter of the earth but it is still possible to calculate the average diameter of the earth. It has been calculated that the average diameter of the geosphere is 12,756km.

Solubility would be your answer.