The soil that's darkest in color is widely known as topsoil. Soil scientists call this layer the "A-horizon." It's the "black, organic, rich soil that's really good for growing crops," says Evan ...

Soil scientists, and anyone who enjoys digging deep (which I highly recommend), knows that soil consists of layers, or horizons. The layers vary in depth and composition, depending on where the ...

O horizon: This is the top layer of soil that is made up of living and decomposed materials like leaves, plants, and bugs. This layer is very thin and is usually pretty dark.

Construction crews began the process of placing the first layers of soil over the Wallis Annenberg Wildlife Crossing on Monday morning. (Al Seib/For The Times) By Seema Mehta.

First layers of soil to be laid on 101 Freeway wildlife crossing, the world's largest. P-22, who captured the hearts of Angelenos, was euthanized in 2022.

A spodosol has a gray horizon from which acids have leached nutrients, depositing it in the reddish horizon below. Photo by Audrey Clark. Editor’s note: Landscape Confidential is an occasional ...

The basic premise of double digging is to create an extra deep bed of loose soil – 16 to 18 inches, versus the 6 to 8 inches that most tillers create – without inverting the soil layers. In the ...

First layers of soil to be laid on 101 Freeway wildlife crossing, the world's largest. Seema Mehta. Mon, March 31, 2025 at 10:00 AM UTC. 2 min read.