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
Rikki and the Last Days of Earth "When the history of the new wave finally started to get written, Rikki and the Last Days of Earth were conspicuous by their absence. No one remembered; nobody cared. Yet without them, a lot of what is now taken for granted about the early '80s might never have occurred". Rikki and the Last Days of Earth Rikki and the Last Days of Earth (formerly Rikki and the Last Days on Earth) were an early British punk group. They were chronicled in 's book "". "Billboard" credited them with paving the way for 1980s new romantic acts. The band was formed