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  2. Lava tube - Wikipedia

    en.wikipedia.org/wiki/Lava_tube

    A broad lava-flow field often forms a lava tube system that consists of a main lava tube and a series of smaller tubes that supply lava to the front of one or more separate flows. When the supply of lava stops at the end of an eruption, or lava is diverted elsewhere, lava in the tube system sometimes drains downslope and leaves partially or ...

  3. List of lava tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Lava_Tubes

    A lava tube, or pyroduct, [1] is a natural conduit formed by flowing lava from a volcanic vent that moves beneath the hardened surface of a lava flow. If lava in the tube empties, it will leave a cave .

  4. Volcanic pipe - Wikipedia

    en.wikipedia.org/wiki/Volcanic_pipe

    Volcanic pipes or volcanic conduits are subterranean geological structures formed by the violent, supersonic eruption of deep-origin volcanoes. They are considered to be a type of diatreme . Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as "carrot-shaped"), and are usually largely composed of one of two ...

  5. Great Man-Made River - Wikipedia

    en.wikipedia.org/wiki/Great_Man-Made_River

    According to the project's website, it is the largest underground network of pipes (2,820 kilometres (1,750 mi)) [3] and aqueducts in the world. It consists of more than 1,300 wells , most more than 500 m deep , and supplies 6,500,000 m 3 of fresh water per day to the cities of Tripoli , Benghazi , Sirte and elsewhere in Libya.

  6. 21 Free and Cheap Underground Spaces to Explore - AOL

    www.aol.com/finance/21-free-cheap-underground...

    Go underground to visit these unusual spaces across the country, from caves to work space to historical artifacts. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: ...

  7. Couple discovers hidden 'lava tube' beneath their house - AOL

    www.aol.com/lifestyle/couple-discovers-hidden...

    A couple in Oregon said they discovered a secret “lava tube” running underneath their home. Suzanne and James Brierley bought their house back in 2017 and had no idea about the existence of an ...

  8. Lava cave - Wikipedia

    en.wikipedia.org/wiki/Lava_cave

    Lava tubes are the most common and extensive type of lava cave. Lava tubes usually form in pahoehoe lava flows, though exceptions exist. As the lava is emitted from the vent area, it spreads in the path of least resistance. The outer layers of the lava harden, while the interior forms horizontal conduits that channel the advance of the flow.

  9. Aqueduct (water supply) - Wikipedia

    en.wikipedia.org/wiki/Aqueduct_(water_supply)

    In Oman from the Iron Age, in Salut, Bat, and other sites, a system of underground aqueducts called falaj or qanāts were constructed, a series of well-like vertical shafts, connected by gently sloping horizontal tunnels. There are three types of falaj: Daudi (داوودية) with underground aqueducts

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