Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Experts have shown that the active layer of permafrost—the upper one or two meters that thaws and re-freezes seasonally—is expanding with the warming climate.
Source: https://phys.org/news/2023-12-natural-gas-migrating-permafrost-methane.html
Over time, the active layer—a layer of soil that freezes in winter and thaws in the summer—thins.
Source: https://phys.org/news/2023-10-alaska-dalton-highway-widespread-ground.html