How cold is cold? The tundra biome is at the top of the world -- around the North Pole! Below a thin layer of tundra soil is its permafrost, a permanently frozen layer of ground. During the brief summers, the top section of the soil may thaw just long enough to allow plants and microorganisms to grow and reproduce. 
Michael Bears Ashley
Copyright © 2002 Missouri Botanical Garden>
MBGnet Home