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
Miley (given name) Miley (given name) Miley is a feminine given name. It was the 278th most popular name given to baby girls born in the United States in 2007, the first year that the name or any of its variants appeared in the top 1,000 names given to baby girls, and rose to 128th in popularity in 2008, though it dropped back down to 189th place in 2009 and to 217th place in 2010. Its popularity is attributed to the fame of actor, singer and songwriter Miley Ray Cyrus (born Destiny Hope Cyrus), whose name originated as a childhood nickname given to