References
David Johnston. (2000, May 10). In St. Helens Hero. Retrieved November 25, 2013 from
http://sthelenshero.homestead.com/DavidJohnston.html
Have There Always Been Continents? (2012, November 10). In Live Science. Retrieved November 25, 2013, from
http://www.livescience.com/32263-have-there-always-been-continents.html
Maasch, K. (1997). What triggers ice ages?. Retrieved
from
http://www.pbs.org/wgbh/nova/earth/cause-ice-age.html
Miller, R. (1983). A revolution in the earth sciences: From continental drift to plate tectonics.
Alexandria: Clarendon Press.
Solar, I. (2013, April 11). In Across the Andes Mountain Range. Retrieved November 25, 2013, from
http://digitaljournal.com/article/347735
Southwestern Advantage. (2011). Science. (pp. 452-526).
Nashville, TN: Southwestern Publishing Group.
unknown. (2010). Ice ages: What are they and what causes them?. 42(3), Retrieved from
http://geology.utah.gov/surveynotes/gladasked/gladice_ages.htm
(2011, July 11). In Across the Andes Mountain Range. Retrieved November 25, 2013, from http://good-
wallpapers.com/places/5097
http://sthelenshero.homestead.com/DavidJohnston.html
Have There Always Been Continents? (2012, November 10). In Live Science. Retrieved November 25, 2013, from
http://www.livescience.com/32263-have-there-always-been-continents.html
Maasch, K. (1997). What triggers ice ages?. Retrieved
from
http://www.pbs.org/wgbh/nova/earth/cause-ice-age.html
Miller, R. (1983). A revolution in the earth sciences: From continental drift to plate tectonics.
Alexandria: Clarendon Press.
Solar, I. (2013, April 11). In Across the Andes Mountain Range. Retrieved November 25, 2013, from
http://digitaljournal.com/article/347735
Southwestern Advantage. (2011). Science. (pp. 452-526).
Nashville, TN: Southwestern Publishing Group.
unknown. (2010). Ice ages: What are they and what causes them?. 42(3), Retrieved from
http://geology.utah.gov/surveynotes/gladasked/gladice_ages.htm
(2011, July 11). In Across the Andes Mountain Range. Retrieved November 25, 2013, from http://good-
wallpapers.com/places/5097