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
Salt crust Salt crust Salt crust is the name given to the method of covering of an ingredient, commonly fish such as sea bass and grouper, in a sand-like mixture of usually egg whites and salt. The salt acts as insulation and helps cook the food in an even and gentle manner. After baking, the golden-brown shell is cracked, resulting in moist and evenly cooked food. The technique is used often with chefs as it simultaneously roasts, steams and seasons. Traditionally fish is seen most commonly using the salt crust method to be baked but in recent times with salt becoming much