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
Douglas (given name) Douglas (given name) Douglas is a Scottish masculine given name which originated from the surname "Douglas". Although today the name is almost exclusively given to boys, it was used as girls name in the seventeenth and eighteenth centuries, in the north of England. The Scottish surname "Douglas" was borne by one of the most powerful families of the Kingdom of Scotland (the Earls of Douglas, Angus, Morton, Dukes of Hamilton and others). It has sometimes been stated that the given name is connected with the given name "Dougal", although it is more likely derived from the surname already mentioned. Linguistically,