1 : Surface area is a country's total area, including areas under inland bodies of water and some coastal waterways. 2  Irrigated land: The number of square kilometers of land area that is artificially supplied with water. 3  Population density: People per square kilometre, in 1999. 4  At this time the world average was 14.42.
A ground fault is an inadvertent contact between an energized conductor and ground or equipment frame. The return path of the fault current is through the grounding system and any personnel or equipment that becomes part of that system.
An area of rock that has numerous fractures of similar trend and dip. Rocks usually do not fail with a clean break, instead they fail through the formation of numerous fractures along a zone of failure. As a result, many named faults are actually zones of fractured rock. The term also has a regulatory use.