Definition of B horizon
: a subsurface soil layer that is immediately beneath the A horizon from which it obtains organic matter chiefly by illuviation and is usually distinguished by less weathering
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“B horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/B%20horizon. Accessed 27 Feb. 2021.
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The first known use of B horizon was in 1938
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