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"Artic and Alpine Tundra." Artic and Alpine Tundra. Web. 10 Feb. 2015. <http://www.mce.k12tn.net/animals/environments/arctic_alpine_tundra.htm>

 

"Seattle Temperatures: Averages by Month." Seattle WA Average Temperatures by Month. Web. 10 Feb. 2015. <http://www.currentresults.com/Weather/Washington/Places/seattle-temperatures-by-month-average.php>.

 

"Environmental Threats." Alpine Tundra. Web. 10 Feb. 2015. <http://alpinetundrabiome.weebly.com/environmental-threats.html>.