B horizon


noun Geology.

the subsoil in a soil profile.

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Question 1 of 7
What does “vacillate” mean?
Also called zone of accumulation.
Compare A horizon, C horizon.

Origin of B horizon

First recorded in 1935–40

Words nearby B horizon

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for B horizon

B horizon

noun

the layer of a soil profile immediately below the A horizon, containing deposits of leached material
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for B horizon

B horizon

In ABC soil, the second and middle zone, characterized by an accumulation of soluble or suspended organic material, clay, iron, or aluminum. These materials originate in the A horizon and are transported to the B horizon through the process of eluviation. B horizons often have a blocky structure and are reddish in color due to the presence of oxidized metals. Also called zone of accumulation zone of illuviation
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.