EVERYDAY SCIENCE

Detailed explanation-1: -A: The A horizon is a surface horizon that largely consists of minerals (sand, silt, and clay) and with appreciable amounts of organic matter. This horizon is predominantly the surface layer of many soils in grasslands and agricultural lands.

Detailed explanation-2: -The O horizon is typically at the top of the soil structure and is made up of mostly organic matter. This organic matter is vital to the growth of crops and other plants because it holds nutrients such as carbon, phosphorus, nitrogen and sulfur.

Detailed explanation-3: -Topsoil is the upper layer of soil. It has the highest concentration of organic matter and microorganisms and is where most of the Earth’s biological soil activity occurs.

Detailed explanation-4: -Soil profiles show the layers of soil, which include topsoil, subsoil and the C horizon. Topsoil has the highest proportion of organic material and is very important for agriculture.

Detailed explanation-5: -Horizon A which is commonly called topsoil is needed to grow most plants. Explanation: Topsoil is suitable because it has highest concentration of organic matter, microorganisms mineral particles, organic matter, water, and air. it contains all the nutrients that plants need to survive.