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  2. Kola Superdeep Borehole - Wikipedia

    en.wikipedia.org/wiki/Kola_Superdeep_Borehole

    The Kola Superdeep Borehole SG-3 (Russian: Кольская сверхглубокая скважина СГ-3, romanized: Kol'skaya sverkhglubokaya skvazhina SG-3) is the deepest human-made hole on Earth (since 1979), which attained maximum true vertical depth of 12,262 metres (40,230 ft; 7.619 mi) in 1989. [1]

  3. List of pearls by size - Wikipedia

    en.wikipedia.org/wiki/List_of_pearls_by_size

    The Pearl of Lao Tzu for a long time thought to be the largest pearl, but claims about its size and much of its history were found to be fabricated by a conman by the name of Victor Barbish. [2] Other pearls like the Centaur Pearl, most likely the largest gem pearl at 856.58 carats (171.316 g), have just recently emerged from private ...

  4. Cave pearl - Wikipedia

    en.wikipedia.org/wiki/Cave_pearl

    A cave pearl is a small, usually spherical, speleothem (cave formation) found in limestone caves. Cave pearls are formed by a concretion of calcium salts that form concentric layers around a nucleus. Exposure to moving water polishes the surface of cave pearls, making them glossy; if exposed to the air, cave pearls can degrade and appear rough.

  5. Hollow Earth - Wikipedia

    en.wikipedia.org/wiki/Hollow_Earth

    Drilling holes does not provide direct evidence against the hypothesis. The deepest hole drilled to date is the Kola Superdeep Borehole, [60] with a true vertical drill-depth of around 12 km (7.5 mi). However, the distance to the center of the Earth is nearly 6,400 km (4,000 mi). [61]

  6. 50 Times People Found Such Strange Things On Google Earth ...

    www.aol.com/lifestyle/76-times-people-found...

    Image credits: Furious Thoughts You can also use Google Earth to explore the planet and various cities, locations, and landscapes using coordinates.The program covers most of the globe (97% back ...

  7. After a 20-Year Search, Scientists Found the Middle-Child ...

    www.aol.com/20-search-scientists-found-middle...

    Scientists confirm an 8,200-solar-mass black hole in the Omega Centauri cluster using 20 years of Hubble data, shedding light on black hole formation and evolution.

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