What is the upper most layer of soil?
No context provided
What is the upper most layer of soil called?
very top layer "O Horizon or A Horizon," Topsoil
Topsoil is the upper, outermost layer of soil, usually the top to . 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. Organic matter varies in quantity on different soils. The strength of soil structure decreases with the presence of organic matter, creating weak bearing capacities. Organic matter condenses and settles in different ways under certain conditions, such as roadbeds and foundations. The structure becomes affected once the soil is dewatered. The soil's volume substantially decreases. It decomposes and suffers wind erosion.
What is the upper most layer of soil composed of?
mineral particles, organic matter, water, and air
Topsoil
Topsoil
https://en.wikipedia.org/wiki/Topsoil
usually the top 5–10 inches
Topsoil
In soil classification systems, topsoil is known as the "O Horizon or A Horizon," therefore, it is the very top layer
Topsoil
Topsoil is the upper, outermost layer of soil, usually the top 5 to 10 inches. In soil classification systems, topsoil is known as the O Horizon or A Horizon; therefore, it is the very top layer. Topsoil 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. 