Question

What determines the thickness of soil profile

Answer 1

Time actually determines thickness of soil profile.Layers of sand,clay,humus,weathered rocks etc. continue to get deposited over already present layers of soil...and one layer of soil takes 100 yrs to deposit.another way is we can find by putting some soil in carbon dating.

Answer 2

There are three principal horizons known as A, B, and C which are present in all dirt.  The organic layer known as the humus layer is a deep layer of plant outlives such as petals and branches. Topsoil - Topsoil is contemplated the "A" horizon. Most soils have three significant horizons such as A, B, C and some have a non-chemical horizon (O)