A term that is sometimes used for oceanic crust rocks is sima, which is short for magnesium silicate, a common component of these rocks. Another term for these undersea igneous rocks is mafic, which comes from the fact that they are high in magnesium and iron. Basalt and gabbro are examples of mafic rocks.
The current record is held by Briton Corporal of Horse (CoH) Craig Harrison, of the UKâs Household Cavalry, who recorded a 2,475 m (2,707 yd) shot (confirmed by GPS) in November 2009, also during the War in Afghanistan, in which he hit two Taliban insurgents consecutively.
Prior to these long shots on Afghan soil, US Marine Corps Gunnery Sergeant Carlos Hathcock held the record for the longest confirmed kill shot. He shot a man at 2,500 yards with a scoped .50-caliber Browning M2 machine gun in 1968 during the Vietnam War.