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
Beulah (given name) Beulah (given name) Beulah (), a feminine given name, originated from the Hebrew word (בְּעוּלָ֑ה "bə‘ūlāh"), used in the Book of Isaiah as a prophesied attribute of the land of Israel. The King James Bible transliterates the word and translates it as "married" (see ). An alternative translation is "espoused", see for example (Mechon Mamre). The "Online Etymology Dictionary" relates the word to "baal", meaning "owner, master, lord". Literary works have used "Beulah" as the name of a mystical place, somewhere between Earth and Heaven. It was so used in "The Pilgrim's Progress" by John Bunyan and in the works