B - Horizon is commonly known as _________
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• Subsoil
• Subsoil is the soil under the top most soil on the surface ground.
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The A horizon is the top layer of the mineral soil often referred to as 'topsoil'.
This layer consists of dark decomposed organic matter, which is known as 'humus'.The A is the surface horizon, and as such is also known as the zone in which most biological activities occur.
B horizon is the next layer after horizon 'A' and is commonly known as ''subsoil''. It consists of mineral layers which are significantly altered by pedogenesis, mostly with the formation of iron oxides and clay minerals.
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