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The NR-1 Sinkhole is a giant underwater sinkhole located in the Straits of Florida 40 miles (64 km) southwest of Key West, Florida. [1] It is found at an approximate depth of 1,886 feet (575 m) of water at the foot of the Pourtales Escarpment, an area of Quaternary sediment.
Deep Submergence Vessel NR-1 was a unique United States Navy (USN) nuclear-powered ocean engineering and research submarine, built by the Electric Boat Division of General Dynamics at Groton, Connecticut. NR-1 was launched on 25 January 1969, completed initial sea trials 19 August 1969, and was home-ported at Naval Submarine Base New London.
Some are caused by karst processes—for example, the chemical dissolution of carbonate rocks [1] or suffosion processes. [2] Sinkholes can vary in size from 1 to 600 m (3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide. [3]
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Named after California Governor Edmund Gerald "Pat" Brown Sr., the over 400-mile (640 km) aqueduct is the principal feature of the California State Water Project. The aqueduct begins at the Clifton Court Forebay at the southwestern corner of the Sacramento–San Joaquin River Delta .
A Ventura County high school closed after a car fell into a sinkhole in front of campus. Other sinkholes appeared at Cal State Los Angeles and in L.A.