'In Arctic or subarctic tundra, it's perennially frozen subsoil, also called pergelisol'
permafrost
COOL!: In Arctic or subarctic tundra, its perennially frozen subsoil, also called pergelisol
In Arctic or subarctic tundra, it's perennially frozen subsoil, also called pergelisol
In Arctic or subarctic tundra, it's perennially frozen subsoil, also called pergelisol
COOL!
permafrost
COOL!