'(<a href="http://www.j-archive.com/media/2012-01-23_J_22.wmv">Sarah of the Clue Crew presents the clue.</a>)  Some define the boundary of the Arctic as the southern limit of the icy region with this, perennially frozen subsoil'
permafrost
THE ARCTIC ENVIRONMENT: Some define the boundary of the Arctic as the southern limit of the icy region with this, perennially frozen subsoil
Some define the boundary of the Arctic as the southern limit of the icy region with this, perennially frozen subsoil
Some define the boundary of the Arctic as the southern limit of the icy region with this, perennially frozen subsoil
THE ARCTIC ENVIRONMENT
permafrost
THE ARCTIC ENVIRONMENT