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hydrothermal fluids
These fluids can be either water or steam trapped in fractured or porous rocks; they are found from several hundred feet to several miles below the Earth's surface. The temperatures vary from about 90° to 680°F (32° to 360°C) but roughly 2/3 range in temperature from 150° to 250°F (65.5° to 121.1°C). The latter are the easiest to access and, therefore, the only forms being used commercially.
Related category
• GEOTHERMAL ENERGY AND POWER
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