Hot springs in the context of "Aguascalientes"

Cyanidiophyceae is a class of unicellular red algae within subdivision Cyanidiophytina, and contain a single plastid, one to three mitochondria, a nucleus, a vacuole, and floridean starch. Pyrenoids are absent. Most are extremophiles inhabiting acid hot springs with a pH between 0,2 and 4 and temperatures up to 56 °C. They originated in extreme environments with high temperatures and low pH, which allowed them to occupy ecological niches without any competition.

While still found in extreme environments, they have also adapted to live along streams, in fissures in rock walls and in soil, but usually prefer relatively high temperatures. They have never been found in basic freshwater or seawater habitats. The main photosynthetic pigment is C-phycocyanin. Except for Galdieria partita, which can reproduce sexually, reproduction is asexual by binary fission or formation of endospores. The group, consisting of a single order (Cyanidiales), split off from the other red algae more than a billion years ago. Three families, four genera, and nine species are known, but the total number of species is probably higher. They are primarily photoautotrophic, but heterotrophic and mixotrophic growth also occurs. After the first massive gene loss in the common ancestor of all red algae, where c. 25% of the genes were lost, a second gene loss occurred in the ancestor of Cyanidiophyceae, where an additional 18% of the genes were lost. Since then, some gene gains and minor gene losses have taken place independently in the Cyanidiaceae and Galdieriaceae, leading to genetic diversification between the two groups, with Galdieriaceae occupying more diverse and varied niches in extreme environments than Cyanidiaceae.

Geothermal energy is thermal energy extracted from the Earth's crust. It combines energy from the formation of the planet and from radioactive decay. Geothermal energy has been exploited as a source of heat and/or electric power for millennia.

Geothermal heating, using water from hot springs, for example, has been used for bathing since Paleolithic times and for space heating since Roman times. Geothermal power (generation of electricity from geothermal energy), has been used since the 20th century. Geothermal power plants produce power at a constant rate, without regard to weather conditions. Geothermal resources are theoretically more than adequate to supply humanity's energy needs. Most extraction occurs in areas near tectonic plate boundaries.

Yangmingshan National Park is one of the nine national parks in Taiwan, located in both Taipei and New Taipei City. The districts that are partially in the park include Taipei's Beitou and Shilin Districts; and New Taipei's Wanli, Jinshan, Sanzhi and Tamsui Districts. The national park is known for its cherry blossoms, hot springs, sulfur deposits, fumaroles, venomous snakes, and hiking trails, including Taiwan's tallest dormant volcano, Qixing (Seven Star) Mountain rising to 1,120 m (3,675 ft). In June 2020, Yangmingshan National Park was certified as the world’s first Urban Quiet Park Quiet Parks International in recognition of World Environment Day.

Onsen tamago (Japanese: 温泉卵 or 温泉玉子, lit. 'hot spring egg') is a traditional Japanese low temperature boiled egg which is slow cooked in the hot waters of onsen (hot springs) in Japan.

The egg has a unique texture in that the white tastes like a delicate custard (milky and soft) and the yolk comes out firm, but retains the colour and creamy texture. This special texture is the result of cooking it in a temperature high enough to solidify the yolk yet too low to solidify the white.

As of 2018, the Philippines has 24 volcanoes listed as active by the Philippine Institute of Volcanology and Seismology (PHIVOLCS). Twenty-one of these have had historical eruptions. The three exceptions are Cabalian, which is a strongly fumarolic volcano; Leonard Kniaseff, which was active 1,800 years ago (C14), and Isarog, which last erupted around 3500 BCE and 2374 BCE ± 87 based on radiocarbon dating

Volcanoes in the country have erupted within the last 600 years, with accounts of these eruptions documented by humans; or have erupted within the last 10,000 years (Holocene). There are 100 volcanoes in the Philippines listed by the Smithsonian Institution's Global Volcanism Program (GVP) at present, of which 20 are categorized as "historical" and 59 as "Holocene". The GVP lists volcanoes with historical, Holocene eruptions, or possibly older if strong signs of volcanism are still evident through thermal features like fumaroles, hot springs, mud pots, etc.

Enping, alternately romanized as Yanping, is a county-level city in Guangdong province, China, administered as part of the prefecture-level city of Jiangmen.

Enping administers an area of 1,698 km (656 sq mi) and had an estimated population of 483,907 in 2020. Its diaspora accounts for around 420,000 overseas Chinese, particularly in the Americas mainly Venezuela. The area around Enping is known for its many hot springs.