Soil Horizons
Soil horizons are the distinct layers of soil you can see when you dig straight down into the ground.
Think of it this way
A lasagna in a baking dish shows layers stacked on top of each other. Each layer has its own color and feel — pasta, sauce, cheese. Soil works the same way. Dig down and you find dark top soil, then lighter clay, then pale rock bits at the base.
Explaining soil horizons by grade level
Dig a deep hole and look at the sides. You see stripes of different colors. Dark soil sits on top. Lighter, rocky dirt is below. Each stripe is a layer that formed over a long time.