What do a.m. and p.m. stand for?

active layer

(in arctic or subarctic regions) the layer of soil, above the permafrost, that thaws during the summer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for active layer
  • The active layer of permafrost, the uppermost ground layer, thaws in the summer and freezes in the winter.
  • Plastic solar cells, no matter how well designed, have intrinsic limits dictated by the polymers that make up their active layer.
  • Until about two years ago, the companies who make silicon wafers weren't able to make the active layer thin enough.
  • Surface soils called the active layer thaw out each summer and refreeze in winter.
  • Modeling results can be highly dependent on this active layer thickness.
  • Once that box is selected a new active layer is added to the drop down menu under map layers.
  • In this structure, the active layer is oriented in registry with the nucleating surface.
  • Click the greyed out select tool beside a layer name to make it the active layer for selections.
  • Immediately above the permafrost may be a transitional zone and above that, reaching to the land surface, is the active layer.

Word of the Day

Difficulty index for active layer

Few English speakers likely know this word

Word Value for active

Scrabble Words With Friends