Editing Spring (hydrology) (section)

===Thermal springs===
[[File:The Mother Spring - Pagosa Hot Springs, Colorado.jpg|thumb|''The Mother Spring'', Pagosa Hot Springs, Colorado]]
{{main|Hot spring}}

The geothermally heated groundwater that flows from thermal springs is greater than human body temperature, usually in the range of {{convert|45|–|50|C|F}}, but they can be hotter.<ref name="Dictionary of Hydrogeology" /> Those springs with water cooler than body temperature but warmer than air temperature are sometimes referred to as warm springs.<ref name="Canadian Journal of ES">{{cite journal |last1=Pentecost |first1=Allan |last2=Jones |first2=B. |last3=Renault |first3=R.W. |title=What is a hot spring? |journal=Canadian Journal of Earth Sciences |date=2003 |volume=40 |issue=11 |pages=1443–1446 |doi=10.1139/e03-083 |bibcode=2003CaJES..40.1443P |url=https://cdnsciencepub.com/doi/10.1139/e03-083 |access-date=15 November 2021|url-access=subscription }}</ref>

====Bathing and balneotherapy====
Hot springs or geothermal springs have been used for [[balneotherapy]], bathing, and relaxation for thousands of years. Because of the folklore surrounding hot springs and their claimed medical value, some have become tourist destinations and locations of [[Physical therapy|physical rehabilitation]] centers.<ref name="ARD">{{cite journal |last1=van Tubergen |first1=A |title=A brief history of spa therapy |journal=Annals of the Rheumatic Diseases |date=1 March 2002 |volume=61 |issue=3 |pages=273–275 |doi=10.1136/ard.61.3.273|pmid=11830439 |pmc=1754027 }}</ref><ref name="DOE">{{cite web |title=A History of Geothermal Energy in America |url=https://www.energy.gov/eere/geothermal/history-geothermal-energy-america |publisher=U.S. Department of Energy Efficiency and Renewable Energy |access-date=30 October 2020}}</ref>
[[File:Spring flowing through grass.jpg|thumb|Natural spring in Pennsylvania where runoff flows from above down through grass and rocks]]

====Geothermal energy====
Hot springs have been used as a heat source for thousands of years. In the 20th century, they became a renewable resource of geothermal energy for heating homes and buildings.<ref name="ARD" /> The city of [[Beppu|Beppu, Japan]] contains 2,217 hot spring well heads that provide the city with hot water.<ref name="CSM">{{cite news |last1=Holtz |first1=Michael |title=Japan builds a head of steam for an alternative to nuclear |url=https://www.csmonitor.com/World/Asia-Pacific/2018/0309/Japan-builds-a-head-of-steam-for-an-alternative-to-nuclear |access-date=17 November 2021 |publisher=Christian Science Monitor |date=9 March 2018}}</ref> Hot springs have also been used as a source of sustainable energy for greenhouse cultivation and the growing of crops and flowers.<ref name="sustain energy">{{cite web |title=Case Studies in Hot Spring Use for Sustainable Energy |url=https://www.pref.oita.jp/uploaded/attachment/2049215.pdf |publisher=Oita Prefectural Government |access-date=17 November 2021}}</ref>