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
Siri (given name) The Faroese spelling of the name is Sirið; the ð is not pronounced. The other spelling without ð is also common. To a lesser extent it is also used in Denmark. Siri is also a Indian female given name. It is a Telugu language word, meaning wealth or fortune. It is a popular given name in Andhra pradesh, Karnataka and Telangana states of south-central India. Siri (given name) Siri is a Scandinavian female given name. It is a short form of Sigrid, of Old Norse origin, and literally meaning "beautiful victory", from Old Norse "sigr" (victory) and Old Norse "fríðr"