Lithosphere 50–140 km thick (but beneath the mid-ocean ridges is no thicker than the crust), while continental lithosphere has a range in thickness from about 40 km to perhaps 280 km; the upper ~30 to ~50 km of typical continental lithosphere is crust. The mantle part of the lithosphere consists largely of peridotite. The crust is distinguished from the upper mantle by the change in chemical composition that takes place at the Moho discontinuity. Oceanic lithosphere consists mainly of mafic crust and ultramafic mantle (peridotite) and is denser than continental lithosphere, for which the mantle is associated with crust made of
The Earth Museum are like lamps lighted where we need them most, illuminating what is around them and the way we need to go. The fuel of those lamps is the imagination. Thank you, my Turkish readers and friends and fellow-writers, for keeping the light burning."" (Ursula K. Le Guin, January, 2018) The Earth Museum features Burak Albayrak as the editor, Tuðçe Nida Sevin as the coordinator and includes a preface by Bulent Akkoc. The collection comprises the following short stories: The Earth Museum The Earth Museum () is an anthology of 18 science-fiction stories by 18 Turkish sci-fi writers published in January