permafrost /RESEARCH/
[DE] Dauerfrostboden; Permafrostboden
[EN] permafrost
[FR] pergélisol; permagel
pergelisol,permafrost,permanent frost /SCIENCE/
[DE] Dauerfrost; Dauerfrostboden; Permafrost
[EN] pergelisol; permafrost; permanent frost
[FR] pergélisol; permagel; sol gelé en permanence