Переведите текст. geothermal energy. the power under our feet the deep regions of the earth are extremely hot, reaching tempera- tures in the molten interior of 2000°f or more. in most parts of the world, temperature increases gradually with depth-roughly 1.8 °f for every 100 feet. huge local hot spots exist sufficiently close to the sur- face to be of practical value. these hot spots, with temperatures of about 150 to 750 °f, are known as geothermal reservoirs. the energy in geothermal reservoirs consists of heat stored in rock and, to a smaller extent, in water or steam confined under pressure in rock fractures. to recover the energy, wells are drilled through the im- permeable layers above the reservoir and the trapped water and steam rush to the surface. most geothermal reservoirs lie in areas of recent volcanic activity and movements of the earth's crust. scientists believe that upheavals within the earth pushed hot molten and semisolid materials up from the interior creating local geothermal areas close to the surface. the heat behind this is the result of slow decay of radioactive elements, such as uranium and thorium, deep within the earth. experts estimate that only five to ten per cent of all geo-thermal reservoirs contain dry steam. more common are wet steam fields with water superheated from 350 to 700 °f. when the pressure is relieved by drilling into the field, the superheated water flashes into a mixture of 20 per cent steam and the rest hot water. power generating stations utilizing wet steam are already in opera- tion in countries including italy, iceland, new zealand, japan and rus- sia.
