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
Rebecca (given name) Rebecca (given name) Rebecca or Rebekah (Hebrew: רִבְקָה ("Rivkah")) is a feminine given name originating from the Hebrew language. The name comes from the verb רבק ("rbq"), meaning "to tie firmly"; Jones' Dictionary of Old Testament Proper Names and the NOBS Study Bible Name List suggest the name means "snare", "noose", "tied up", "secured", and even "beautifully ensnaring". W. F. Albright held that it meant "soil, earth". Rebecca was the wife of Isaac and the mother of Jacob and Esau in the Hebrew Bible. The Latin Vulgate uses the spelling Rebecca exclusively and it is followed by ("ex. gr.") Wycliffe