The absence of a layered structure in the soil pictured below occurs because
A)leaching is so strong that it removes the distinguishing features of each layer.
B)swelling as the soil absorbs water and shrinking as it dries out removes the horizonation.
C)calcification has caused caliche to be left behind in all of the horizons.
D)volcanic ash has penetrated very deeply beneath the surface in this soil type.

Question

The absence of a layered structure in the soil pictured below occurs because 
A)leaching is so strong that it removes the distinguishing features of each layer. 
B)swelling as the soil absorbs water and shrinking as it dries out removes the horizonation. 
C)calcification has caused caliche to be left behind in all of the horizons. 
D)volcanic ash has penetrated very deeply beneath the surface in this soil type.

Quizplus · Accepted Answer

The absence of a layered structure in the soil is due to swelling as the soil absorbs water and shrinking as it dries out. This process removes the horizonation, resulting in a uniform soil structure without distinct layers.

The Absence of a Layered Structure in the Soil Pictured