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.
In actuality, the Kola Superdeep Borehole consists of several holes branching from one central hole. The deepest of these, named SG-3, measures just nine inches in diameter but extends 12,261 meters (or 7.5 miles) into the Earth. That's roughly a third of the way through the Baltic continental crust.