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active layer

American  

noun

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


Example Sentences

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When electricity passes through, electrons and holes recombine inside the active layer.

From Science Daily Mar. 4, 2026

In aspect ratio phase trapping, defects, as well as the undesirable hexagonal phase, are "trapped" inside the grooves so that the surface of the active layer is a perfect cubic-phase material.

From Science Daily Jan. 23, 2024

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

Increased phase separation and crystallization have a profound effect on the photophysical and transport properties 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

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