The answer is B. Layers of soil get rockier as they get deeper.
Soil is in essence mature while it accomplishes a dampness stage that licenses it to hinder into bunches estimating 1-10 mm. (With a superior dampness content, the dirt adheres to the culturing carry out; with a diminishing dampness content, the dirt breaks into large bunches and blocks.)
A soil can not be more experienced than the most seasoned hedges creating in it. It can not be more seasoned than the substances wherein it desk work or the display on which it's far found. Soil researchers compositions with geologists to conclude how one of a kind the display is, and the manner in which extensive the figure substances had been there.
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