versus the 6 to 8 inches that most tillers create – without inverting the soil layers. In the natural process of soil development, distinct layers, called “soil horizons,” develop, where the most ...

Students must analyze each top layer of soil – called a soil horizon – within their pit and based on that come to different conclusions about the history of the area and what the best use of that soil ...

Judith Turk, an assistant professor at the University of Nebraska-Lincoln, studies the top layer of desert soils, called the vesicular horizon. This surface layer of the soil is common in deserts ...