|Slicing carefully through soil we will find that less that half of its volume is solid. The rest is a complex arrangement of pores and channels. It is these pores and channels, which enable so much activity to occur.
This arrangement can be represented more generically by the following:
Soil as a porous and permeable environment
The composition and arrangement of all soils.
#The proportion of solids to pores depends on the structural arrangement of solids as stabilised by clays and organic materials
Why is soil valuable?
Soil makes the earth habitable.
It does this by:
Soil is the interface linking the four spheres: atmosphere; hydrosphere; geosphere; and biosphere (Rimmer 1998)