Geothermal Energy USDOE

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Geothermal Energy USDOE ( geothermal-energy-usdoe )

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(<3,000 m). Although hot dry rock resources are virtually unlimited in magnitude around the world, only those at shallow depths are currently economical. To extract heat from such formations, the rock must be fractured and a fluid circulation system developed. This is known as an enhanced geothermal system (EGS). The water is then heated by way of conduction as the it passes through the fractures in the rock, thus becoming a hydrothermal fluid. The final source of geothermal energy is magma, which is partially molten rock. Molten rock is the largest global geothermal resource and is found at depths below 3-10km. Its great depth and high temperature (between 700°C and 1200°C) make the resource difficult to access and harness. Thus, technology to use magma resources is not well developed. Geothermal power is already an important energy resource for our nation and the world. Hydrothermal plants in the western states now provide about 2,500 megawatts of constant, reliable electricity, which meets the residential power needs for a city of 6 million people. Over 8,000 megawatts are currently being produced worldwide. A variety of industries, including food processing, aquaculture farming, lumber drying, and greenhouse operations, now benefit from direct geothermal heating. The alligators in the following picture are grown in geothermally heated water in Idaho. Hydrothermal systems also provide district heating. District systems distribute hydrothermal fluid from one or more geothermal wells through a series of pipes to several individual houses and buildings, or blocks of buildings. National Science Education Standards by the National Academy of Sciences Science Content Standards: Grades 6-8 Science As Inquiry 3⁄4 Content Standard A: • Abilities necessary to do scientific inquiry • Understandings about scientific inquiry Physical Science 3⁄4 Content Standard B: • Properties and changes of properties in matter • Motions and Forces • Transfer of energy Earth and Space Science 3⁄4 Content Standard D: • Structure of the Earth System

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