Crust (geology) crustal rocks formed before 2.5 billion years ago are located in cratons. Such old continental crust and the underlying mantle asthenosphere are less dense than elsewhere in Earth and so are not readily destroyed by subduction. Formation of new continental crust is linked to periods of intense orogeny; these periods coincide with the formation of the supercontinents such as Rodinia, Pangaea and Gondwana. The crust forms in part by aggregation of island arcs including granite and metamorphic fold belts, and it is preserved in part by depletion of the underlying mantle to form buoyant lithospheric mantle. A theoretical protoplanet named
Gordon (given name) "-o", "-onis". The given name is thought to have been used in honour of Major-General Charles George Gordon (1833–85), who was killed at Khartoum. The masculine given name can be represented in Scottish Gaelic as Gòrdan. The diminutive Gord may also be used as a nickname. Gordon (given name) Gordon is a masculine given name in the English language. The name is derived from the Scottish surname "Gordon". It is uncertain if this surname originated from a place name in Scotland or in France. The Gordon in Berwickshire, where the family who bore the surname held lands in the 12th