active layer
Americannoun
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The ground contains a layer known as the "active layer," which freezes and thaws each year.
From Science Daily ● Apr. 4, 2026
Over time, the active layer -- a layer of soil that freezes in winter and thaws in the summer -- thins.
From Science Daily ● Oct. 11, 2023
Built in the early 1960s, Arecibo was initially designed to study the Earths ionosphere, the chemically active layer in the upper atmosphere that is ionized by solar radiation.
From Slate ● Nov. 23, 2020
This sequence of steps is affected by the morphology of the active layer.
From Nature ● Aug. 15, 2012
Because the frozen permafrost was just a half meter beneath the active layer of soil, all the water on the tundra stayed near the surface.
From "Two Degrees" by Alan Gratz
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
