The surface expression of heat escaping from the Earth's interior, appearing as hot springs, fumaroles, mud pots and geysers where groundwater is heated by nearby magma or residual volcanic heat. Regions of high geothermal activity, such as Yellowstone and Iceland, sit above unusually shallow heat sources and are increasingly tapped for geothermal power generation.
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1. Geothermal activity - Wikipedia
Introduction sectionQuote, Introduction section
can manifest itself in a variety of different phenomena, including, among others, elevated surface temperatures, various forms of hydrothermal activity, and the presence of fumaroles.
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