http://www.articleheaven.net en-us editorial@articlealley.com As planet earth formed, tons of extremely hot substances condensed together. From then on, a reservoir of radioactive chemicals has slowly disintegrated to produce a constant source of heat. The heat coming from the earth due to radio-active decay is pred... http://www.articleheaven.net/considering-the-for-and-against-of-geothermal-energy-usage-2211140.html 05th May 2011