About 22% of the energy used in the U.S. comes from natural gas. There are about 300,000 miles of natural gas pipelines in the lower 48 states and 425,000 gas producing wells. The history of natural gas.
thru-hole. A circuit board packaging technique in which the leads (pins) on discrete components and chips are inserted through holes in the printed circuit board and soldered from beneath.
The deepest hole ever drilled by humans (Russians) is the âKola Super deep Boreholeâ, on Kola Peninsula in the North West corner of Russia, located near Finlandâ. Russian scientists had to invent new ways of drilling, due to the depth of that area. A number of bore holes were drilled by branching from a central hole. The bore hole which reached 12,262 meters (40,230 ft) in 1989 is the deepest hole ever drilled, and the deepest artificial point on the earth.