EVERYDAY SCIENCE

Detailed explanation-1: -The topsoil is relatively thin but it has most of the soil’s nutrients. Just below the topsoil layer is the subsoil layer. The subsoil may contain some broken down organic matter but it is mostly made of weathered rocks and clay minerals.

Detailed explanation-2: -Subsoil is the layer of soil under the topsoil on the surface of the ground. Like topsoil, it is composed of a variable mixture of small particles such as sand, silt and clay, but with a much lower percentage of organic matter and humus, and it has a small amount of rocks which are smaller mixed with it.

Detailed explanation-3: -A soil’s texture depends on the proportion of sand, silt or clay it contains. For example, a soil described as a silt loam contains mainly silt but also will contain some sand and clay in smaller proportions.

Detailed explanation-4: -While clay holds the most nutrients, they may not be readily available to plants, and clay is typically the most difficult to cultivate. Silt also holds more nutrients than sand.