development of the industry and economy of China can be observed personally on streets and squares of Shenzhen lying in the delta of the Pearl river near the coast of the South China Sea in the southern Province of Guangdong. Many call this city Chinese Silicon Valley, and it obviously deserves the similar name, a fair part of production of electronics made both for internal consumption and for export to other countries is concentrated here. Many firms occupied in the sphere of high technologies have the headquarters in Shenzhen.
deepest hollow in the world is the Mariana Trench which length is 10994 meters. There is it in the Pacific Ocean, between East Asia and Australia. Opened this unique miracle in far 1875 when by means of special lot on a corvette of Challenger established record underwater depth. Of course, at that time data were not absolutely exact because of technical difficulties – only 8184 meters then the expedition by the ship of the same name in 1951 by means of the sonic depth finder established new measurement – 10863 meters.
