Sources
Ristinen, Robert. Kraushaar, Jack. Energy and the Environment
2nd ed. Universit of Colorado Boulder. 2006
Geothermal Energy. Ed. Erin Heidtke and students of Geography 378
(International Environmental Problems & Policy). University
of Wisconsin-Eau Clair, USA. Spring 2003.
<http://academic.evergreen.edu/g/grossmaz/heidtken.html>
United States. PG&E News Department. PG&E Seeks Approval for
New Geothermal Energy Contract. 15 Feb. 2008.
<http://uk.reuters.com/article/pressRelease/idUS215675+15-Feb-2008+PRN20080215?symbol=PCG.N>
Geothermal Energy -- Energy from the Earth's Core. Energy Kids Page.
Energy Information Administration. July 2007.
<http://www.eia.doe.gov/kids/energyfacts/sources/renewable/geothermal.html>
Office of Geothermal Technologies. U.S. Department of Energy.
Geothermal Heat Pumps Make Sense for Homeowners. April 1999.
<http://www1.eere.energy.gov/geothermal/pdfs/26161b.pdf>
SchoolNet Greassroots Program. Iceland Adventure Website. Ed. Corbin,
M. 2006. <http://iceland.ednet.ns.ca/schedule.htm>