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.
Craig Harrison has the longest confirmed sniper kill shot in military history. The most astounding detail is that he did it twice, in a matter of seconds. The shots were executed at a staggering distance of 2,707 yards (1.53 miles) with a .338 Lapua Magnum rifle.