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  2. Southeast Missouri Lead District - Wikipedia

    en.wikipedia.org/wiki/Southeast_Missouri_Lead...

    The formal geological name for the Lead Belt is the "Southeastern Missouri Mississippi Valley-type Mineral District". It contains the highest concentration of galena (lead(II) sulfide) in the world [2] as well as significant economic quantities of zinc, copper and silver and currently mined sub-economic quantities of metals such as cadmium, nickel and cobalt. [2]

  3. Recreational dive sites - Wikipedia

    en.wikipedia.org/wiki/Recreational_dive_sites

    Scuba diving quarries are depleted or abandoned rock quarries that have been allowed to fill with ground water, and rededicated to the purpose of scuba diving. They may offer deep, clean, clear, still, fresh water with excellent visibility, or low visibility in turbid water from surface runoff. They have no currents or undertow.

  4. Underwater diving - Wikipedia

    en.wikipedia.org/wiki/Underwater_diving

    Scuba diving tourism is a growth industry, and it is necessary to consider environmental sustainability, as the expanding impact of divers can adversely affect the marine environment in several ways, and the impact also depends on the specific environment. Tropical coral reefs are more easily damaged by poor diving skills than some temperate ...

  5. Underwater sports - Wikipedia

    en.wikipedia.org/wiki/Underwater_sports

    Finswimming is an underwater sport consisting of four techniques involving swimming with the use of fins either on the water's surface using a snorkel using either monofins or bifins (i.e. one fin for each foot) or underwater with monofin either by holding one's breathe or underwater using open circuit scuba diving equipment.

  6. Bonne Terre Mine - Wikipedia

    en.wikipedia.org/wiki/Bonne_Terre_Mine

    Bonne Terre Mine, also known as the St. Joseph Lead Mine at Bonne Terre, is a historic lead mine located at Bonne Terre, St. Francois County, Missouri. Bonne Terre Mine was built starting in 1864 by the St. Joe Lead Company, and is located below the city of Bonne Terre. The mine closed in 1962.

  7. Recreational diving - Wikipedia

    en.wikipedia.org/wiki/Recreational_diving

    Scuba diver in Panama. Recreational diving may be considered to be any underwater diving that is not occupational, professional, or commercial, in that the dive is fundamentally at the discretion of the diver, who dives either to their own plan, or to a plan developed in consensus with the other divers in the group, though dives led by a professional dive leader or instructor for non ...

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  9. Dive center - Wikipedia

    en.wikipedia.org/wiki/Dive_center

    A dive center is the base location where recreational divers usually learn scuba diving or make guided dive trips at new locations. Many dive centers operate under the guidelines of ISO 24803, [1] in which case the facilities must meet the ISO minimum standard for a service provider for recreational diving.