Environmentally hazardous pesticides can pollute groundwater when they are overused in agricultural areas. A nuclear-waste storage site must be isolated for 10,000 years to be considered safe by government standards. The transitional zone between the zone of aeration and the zone of saturation. Water stored in the subsurface. Naturally formed underground chambers.
Geothermal energy contributes a large portion of U.S.energy demand.
Geothermal energy has been proven in experimental sites but has not been developed commercially. Commercial geothermal energy production involves drilling wells into hot, dry, rock. Commercial geothermal energy production involves drilling wells into areas with hot groundwater reserves.