Question

The correct increasing order of the surface areas of soils

Answer 1

A. clay → sand → silt →gravel
B. silt → sand → clay → gravel
C. clay → silt → sand → gravel
D. silt → clay → sand → gravel

Answer 2

The correct increasing order of the surface area of soil includes

fine sand, clay, silt colloids.

Explanation:

• Sand is a 'granular material' composed of 'finely divided rock' and mineral particles

• Clay is a 'finely-grained natural rock' or soil material that 'combines' 'one or more' clay minerals.

• Geologic clay 'deposits' are mostly formed of 'phyllosilicate minerals' including changeable 'amounts of water' trapped in the mineral structure.

• The 'clay-sized' and the 'fine silt-sized particles' are distributed as colloids.

• The fine size of the colloidal particles is responsible for their very high surface ratio.

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