EVERYDAY SCIENCE

Detailed explanation-1: -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. Humus is rich, highly decomposed organic matter mostly made from dead plants, crunched-up leaves, dead insects and twigs.

Detailed explanation-2: -Humus is the dead and decaying bits of animals and plants present in the topmost layer of soil.

Detailed explanation-3: -The topmost horizon is the ‘A’ horizon and, as we have noted above, is usually the darkest layer of the soil because it contains most of the organic matter. Here, remnants of plants and even animals are incorporated into the soil.

Detailed explanation-4: -The uppermost layer is called topsoil and this layer contains humus, plant roots, and living creatures. The more humus found in topsoil, the more nutrient rich the topsoil and the better the conditions for growing plants.

Detailed explanation-5: -The uppermost layer of the soil is called topsoil and this layer contains humus, plant roots, and living creatures.