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Sonar mapping of the Challenger Deep by the DSSV Pressure Drop employing a Kongsberg SIMRAD EM124 multibeam echosounder system (26 April – 4 May 2019). The Challenger Deep is a relatively small slot-shaped depression in the bottom of a considerably larger crescent-shaped oceanic trench, which itself is an unusually deep feature in the ocean floor.
The sonar mapping of the Challenger Deep was possible by its Simrad EM120 sonar multibeam bathymetry system for deep water. The sonar system uses phase and amplitude bottom detection, with an accuracy of better than 0.2% of water depth across the entire swath (implying that the depth figure is accurate to ± 22 metres (72 ft; 12 fathoms)). [18 ...
During talks with the Indian government, Google issued a statement saying "Google has been talking and will continue to talk to the Indian government about any security concerns it may have regarding Google Earth." [4] Google agreed to blur images on request of the Indian government. [1]
A population density map of Guam, 2000 A 1668 description reported that there were approximately 180 Chamoru villages on Guam with a total island population between 35,000 and 50,000. [ 12 ] The Spanish strategy of villagization , called reducción , which began in the Spanish-Chamorro Wars , transferred the population to seven towns.
Kelly Walsh after completing an 11,000m dive to Challenger Deep, the deepest location on Earth, in 2020 (Mike Moore / EYOS Experience) Mr Walsh became the 11th person to make a successful dive to ...
The Challenger Deep, located just outside the Trench Unit, is the deepest point in the Earth's oceans, deeper than the height of Mount Everest above sea level. It is five times longer than the Grand Canyon and includes some 78,956 square miles (204,500 km 2) of virtually unexplored underwater terrain.
Trenches were not clearly defined until the late 1940s and 1950s. The bathymetry of the ocean was poorly known prior to the Challenger expedition of 1872–1876, [12] which took 492 soundings of the deep ocean. [13] At station #225, the expedition discovered Challenger Deep, [14] now known to be the southern end of the Mariana Trench.
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