GENERAL KNOWLEDGE

Detailed explanation-1: -Topsoil. The layers of the soil are called horizons. The uppermost horizon is called the topsoil layer. The topsoil layer is a mixture of sand, silt, clay and broken down organic matter, called humus.

Detailed explanation-2: -The uppermost horizon of the soil is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water. It is called the topsoil or the A-horizon.

Detailed explanation-3: -The topmost layer of the soil that contains humus and living organisms in addition to the soil particles is called the topsoil.