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
Iselilja (given name) Iselilja (given name) Iselilja is a Norwegian feminine given name. In 2015, in Norway 17 people had the name as a first name and 15 people had it as a middle name, according to SSB's name statistics. "Iselilja" is mentioned in the medieval Norwegian ballad , a song that has been recorded and released by Alf Cranner on the album "Rosemalt Sound" (1967), by the folk-rock band on "" (1978), and by Norwegian folk music band Gåte on their studio album "Iselilja" (2004) and their live album "Liva" (2006). The name is, according to Norwegian historian Harald S. Næss in