Crust (geology) depth, reaching values typically in the range from about to at the boundary with the underlying mantle. The temperature increases by as much as for every kilometer locally in the upper part of the crust, but the geothermal gradient is smaller in deeper crust. The continental crust has an average composition similar to that of andesite. The most abundant minerals in Earth's continental crust are feldspars, which make up about 41% of the crust by weight, followed by quartz at 12%, and pyroxenes at 11%. Continental crust is enriched in incompatible elements compared to the basaltic ocean crust and much
The Cyborg from Earth In the end, Jeff finds that he is not a coward and everyone else knows that as well. The engines used by Vanguard Mining's spacecraft are Diabelli Omnivores. This particular brand of engine is used repeatedly throughout Sheffield's books, across many different fictional settings. The Cyborg from Earth The Cyborg from Earth is a 1998 science fiction novel by Charles Sheffield. It is the fourth in a series of unrelated stories, published by Tor Books in their Jupiter line. The novel starts in a future dystopian Earth where the upper class lives a life of privilege, while most others live