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A hot spring is a spring produced by the emergence of geothermally heated groundwater that rises from the Earth's crust. There are geothermal hot springs in many locations all over the crust of the earth. While some of these springs contain water that is the correct temperature for bathing, others are too hot to do so and immersion can result in injury or death. ==Definitions== There is no universally accepted definition of a hot spring. For example, one can find the phrase ''hot spring'' defined as * any geothermal spring * a spring with water temperatures above its surroundings〔(Miriam-Webster Online dictionary definition of hot spring )〕 * a natural spring with water temperature above body temperature – normally between 〔(Wordsmyth definition of hot spring )〕 * a natural spring with warm water above body temperature〔(American Heritage dictionary, fourth edition (2000) definition of hot spring )〕 * a thermal spring with water warmer than 〔(Infoplease definition of hot spring )〕〔(Random House Unabridged Dictionary, © Random House, Inc. 2006. definition of hot spring )〕 * a natural spring of water greater than (synonymous with thermal spring)〔(Wordnet 2.0 definition of hot spring )〕〔(Ultralingua Online Dictionary definition of hot spring )〕〔(Rhymezone definition of hot spring )〕〔(Lookwayup definition of hot spring )〕 * a natural discharge of groundwater with elevated temperatures〔(Columbia Encyclopedia, sixth edition, article on hot spring )〕 * a type of thermal spring in which hot water is brought to the surface. The water temperature of a hot spring is usually or more above mean air temperature.〔 Leet states that there are two types of thermal springs; hot springs and warm springs.〕 Note that by this definition, "thermal spring" is not synonymous with the term "hot spring" * a spring whose hot water is brought to the surface (synonymous with a thermal spring). The water temperature of the spring is usually or more above the mean air temperature. * a spring with water above the core human body temperature – .〔 provides a critical discussion of the definition of a hot spring.〕 * a spring with water above average ambient ground temperature〔For example, ambient ground temperature is usually around in the eastern United States〕 * a spring with water temperatures above 〔US NOAA Geophysical Data Center definition〕 The related term "warm spring" is defined as a spring with water temperature less than a hot spring by many sources, although Pentecost et al. (2003) suggest that the phrase "warm spring" is not useful and should be avoided.〔 The US NOAA Geophysical Data Center defines a "warm spring" as a spring with water between . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hot spring」の詳細全文を読む スポンサード リンク
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