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active layer

noun

(in arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer.

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Nearby words

active duty, active galactic nucleus, active galaxy, active hyperemia, active immunity, active layer, active list, active margin, active mass, active matrix, active methyl

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019