Meaning of the word permafrost in English

What does permafrost mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

permafrost

US /ˈpɝː.mə.frɑːst/
UK /ˈpɜː.mə.frɒst/

Noun

a thick subsurface layer of soil that remains frozen throughout the year, occurring chiefly in polar regions and at high altitudes

Example:
The melting of permafrost releases greenhouse gases into the atmosphere.
Construction in areas with permafrost requires special techniques.