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19 Biofuels 6; ill. 11 Businesses 13; ill. 42 Carbon dioxide 10, 29, 31 Climate change 10 Coal 8, 9; ills. 10, 11 Colorado 23; ills. 22, 42 Colter, John 12, 16 Conti, Prince Piero Ginori 17 Cooling see Heating and cooling Core (geology) 4; ill. S. 39, 40, 41, 43 Direct use 5–6, 14, 15, 16, 23, 25 District heating 13, 23 Drawbacks of geothermal energy 32–37 Drilling and installation 22, 29, 32; ills. 36, 40, 41 environmental problems 34–35, 36–37 safety concerns 40, 41 technology for 33, 36 Dry-steam plants 18, 20; ill.

Renewable: A resource that never gets used up. Energy sources such as sunlight and wind are renewable; sources such as coal, natural gas, and oil are nonrenewable. reservoir: A naturally occurring underground body of water. Richter scale: A scale for measuring the severity of earthquakes. rotor: A part of a machine that turns. sustainable: Able to last and not power plant: A place for the be used up. ” working that leave plenty of natural projectile: An object that is moved resources for the future.

17, 27, 31 environmental issues 31, 34, 35 types of 18–22; ill. 19 Need for alternative energy 7–11 New York 23, 24, 28 Research and experimentation 8, 21, 22, 36, 37 trends in 41, 42 Reservoirs 16, 21, 39 Resorts and spas 8, 12–13 Resources, availability of 24; map 39 Ring of Fire 26; map 26 Sludge 35 Sources of energy 8; ill. 11 Tectonic plates 24, 26 Temperature 4, 9, 10, 16, 18, 20, 21, 24, 25, 38 Turbines 18, 20, 21; ill. 19 United States 6, 8, 9, 24, 30, 38; ill. 11, map 39 economic benefits to 29 oil import 30 Use of energy 5–7, 11, 12–14, 22–23 Volcanoes 4, 17, 24, 26; ill.

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