One of the mysteries of the English language finally explained.
A notional column of soil that extends vertically from the surface to the underlying parent material and is of sufficient area (usually at least a square metre) to be representative of the surrounding soil and its horizons.
1960s. Either from pedo- + -on, or from ancient Greek πέδον ground, earth.
In this article we explore how to impress employers with a spot-on CV.