मानक ऑक्जेलिक अम्ल की सहायता से दिए गए के मेनोपॉज के गोल की सुंदरता निर्धारित करें
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The layer of soil which is just below the top-soil is called B-horizon. It is also known as sub-soil. The sub-soil is made up of slightly bigger rock particles than that of top-soil. ... The sub-soil has very little humus (decayed organic matter).
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