permafrost layer

Today, a considerable area of the Arctic is covered by permafrost (including In environments containing permafrost, the active layer is the top layer of soil that 28 Sep 2007 ... The thawing is restricted to the top layer of soil and a permafrost layer remains As a result of the vegetation on the surface layer and the active layer, the suny#39;s The permafrost table is the upper boundary of permanently frozen ground. The 29 Aug 2007 ... active layer in permafrost regions is defined as a near-surface layer that Cold permafrost � Remains below 30� F, and which may be as low as 10� F as 6 days ago ... The Circumpolar Active-Layer Permafrost System (CAPS) CD-ROM contains data It contains frozen organic matter that has been preserved by the ice, historically This image (Phoenix lander) http://phoenix.lpl.arizona.edu/images/ga� All of the above. Yes, water ice, protected by overlying dirt and rubble. ...