10. The tundra biome
    Tundra is the coldest of all the biomes. Tundra comes from the Finnish word tunturi, meaning treeless plain.
    http: //ucmp.berkeley.edu/exhibits/biomes/tundr...
    
    
11. Tundra
    
    http: //runet.edu/~swoodwar/CLASSES/GEOG235/bio...
    
    
12. Tundra Biome
    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.
    http: //mobot.org/mbgnet/sets/tundra/index.htm
    
    

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