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  2. Tufa - Wikipedia

    en.wikipedia.org/wiki/Tufa

    Tufa columns at Mono Lake, California. Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine. Tufa is sometimes referred to as ...

  3. Travertine Hot Springs - Wikipedia

    en.wikipedia.org/wiki/Travertine_Hot_Springs

    Travertine Hot Springs are located two miles Southeast of Bridgeport, California on several sizeable travertine terraces, overlooking views of the High Sierra mountains. [2] Volunteers have built a series of primitive rock pools and wood-and-concrete enclosures to contain the water, and to control temperature by diverting the flow through ...

  4. Travertine - Wikipedia

    en.wikipedia.org/wiki/Travertine

    Travertine terraces at Mammoth Hot Springs, Yellowstone National Park, in 2016 Calcium-carbonate-encrusted, growing moss in a low-temperature freshwater travertine formation (1 euro coin for scale) Travertine (/ ˈ t r æ v ər t iː n / TRAV-ər-teen) [1] is a form of terrestrial limestone deposited around mineral springs, especially hot ...

  5. The Geysers - Wikipedia

    en.wikipedia.org/wiki/The_Geysers

    The Geysers is the world's largest geothermal field, containing a complex of 18 geothermal power plants, drawing steam from more than 350 wells, located in the Mayacamas Mountains approximately 72 miles (116 km) north of San Francisco, California. Geysers produced about 20% of California's renewable energy in 2019. [4]

  6. Tonto Natural Bridge - Wikipedia

    en.wikipedia.org/wiki/Tonto_Natural_Bridge

    The area surrounding the bridge has been made into a state park called Tonto Natural Bridge State Park, which is located off State Route 87, just 10 miles (16 km) north of Payson. Tonto Natural Bridge stands over a 400-foot-long (120 m) tunnel that measures 150 feet (46 m) at its widest point and reaches a height of 183 feet (56 m).

  7. California High-Speed Rail - Wikipedia

    en.wikipedia.org/wiki/California_High-Speed_Rail

    California High-Speed Rail (CAHSR) is a publicly funded high-speed rail system being developed in California by the California High-Speed Rail Authority. Phase 1, about 494 miles (795 km) long, is planned to run from San Francisco to Los Angeles and Anaheim via the Central Valley , and is partially funded and under construction.

  8. Active-pixel sensor - Wikipedia

    en.wikipedia.org/wiki/Active-pixel_sensor

    An active-pixel sensor (APS) is an image sensor, which was invented by Peter J.W. Noble in 1968, where each pixel sensor unit cell has a photodetector (typically a pinned photodiode) and one or more active transistors.