Definition of D-horizon
: a soil layer that sometimes occurs beneath the B-horizon or the C-horizon if present, that has not been subjected to weathering, and that may consist of the unmodified mineral matter from which the more superficial layers developed or of a different complex of mineral matter
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“D-horizon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/D-horizon. Accessed 28 Feb. 2021.
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