Topsoil is the upper, outermost layer of soil, usually the top 5–10 inches. It has the highest concentration of organic matter and microorganisms and is where most of the Earth's biological soil activity occurs. Topsoil is composed of mineral particles, organic matter, water, and air.

What is topsoil explain?

Topsoil is the upper layer of soil, usually between 2 to 8 inches in depth, that contains most of the ground's nutrients and fertility. If you have poor soil in your garden and want to begin planting veg or laying turf, buying fresh topsoil will ensure your plants will get a great start.

What is in the topsoil?

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. Topsoil is the home of living things and the materials that they make or they change.