pedosphere

The outermost layer of the Earth that is composed of soil. The pedosphere is the skin of the Earth and only develops when there is a dynamic interaction between the atmosphere (air in and above the soil), biosphere (living organisms), lithosphere (unconsolidated regolith and consolidated bedrock) and the hydrosphere (water in, on and below the soil). The pedosphere is the foundation of terrestrial life on this planet.

Citation: 
https://en.wikipedia.org/wiki/Pedosphere
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