tailieunhanh - Encyclopedia of Global Resources part 63

Encyclopedia of Global Resources part 63 provides a wide variety of perspectives on both traditional and more recent views of Earth's resources. It serves as a bridge connecting the domains of resource exploitation, environmentalism, geology, and biology, and it explains their interrelationships in terms that students and other nonspecialists can understand. The articles in this set are extremely diverse, with articles covering soil, fisheries, forests, aluminum, the Industrial Revolution, the . Department of the Interior, the hydrologic cycle, glass, and placer mineral deposits. . | 568 Helium Global Resources Kabat Geoffrey C. Hyping Health Risks Environmental Hazards in Daily Life and the Science of Epidemiology. New York Columbia University Press 2008. Lippmann Morton ed. Environmental Toxicants Human Exposures and Their Health Effects. 3d ed. Hoboken . John Wiley Sons 2009. Rodricks Joseph V. Calculated Risks The Toxicity and Human Health Risks of Chemicals in Our Environment. 2d ed. New York Cambridge University Press 2007. Sala Osvaldo E. Laura A. Meyerson and Camille Parmesan eds. Biodiversity Change and Human Health From Ecosystem Services to Spread of Disease. Washington . Island Press 2009. Skjei Eric and M. Donald Whorton. Of Mice and Molecules Technology and Human Survival. New York Dial Press 1983. Web Site World Health Organization Environmental Health http topics environmental_ health en See also Air pollution and air pollution control Asbestos Environmental degradation resource exploitation and Greenhouse gases and global climate change Mining safety and health issues Nuclear waste and its disposal Pesticides and pest control Population growth United Nations Convention on Long-Range Transboundary Air Pollution Water pollution and water pollution control. Helium Category Mineral and other nonliving resources Where Found Helium is concentrated in some natural gas wells particularly in Texas Oklahoma and Kansas. Helium is also found in the Earth s atmosphere. Primary Uses The most important use of helium is as a cr yogenic coolant since it permits cooling to temperatures lower than any other substance. Helium is also used as a lifting gas for airships as a replacement for nitrogen in the breathing gas for deep-sea divers and as an inert atmosphere for welding. Technical Definition Helium abbreviated He atomic number 2 belongs to the last column of the periodic table of the elements. It has two naturally occurring isotopes and an average molecular weight of . Helium is a gas having a density of gram .