| 单词 | a horizon |
| 释义 | A horizon[ eyhuh-rahy-zuhn ] / ˈeɪ həˌraɪ zən / noun Geology.the topsoil in a soil profile. Also called zone of leaching . Compare B horizon, C horizon. Origin of A horizonFirst recorded in 1935–40 Words nearby A horizonahold, a-hole, -aholic, aholt, Ahom, A horizon, ahorse, horse of a different color, a, ahoy, AHQ, AHRA Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for A horizonA horizon nounthe top layer of a soil profile, usually dark-coloured and containing humus and from which soluble salts may have been leachedSee B horizon, C horizon 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 A horizonA horizon In ABC soil, the uppermost, darkest zone that is rich in organic matter. The upper section of the A horizon usually contains humus along with plant and animal matter in varying stages of decay. The middle section usually contains a high concentration of quartz or other minerals that remain following the leaching away of clay, iron, and aluminum. The lower section is typically transitional in nature between the A horizon and the B horizon. Also called zone of leaching The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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