Core–mantle boundary Core–mantle boundary The core–mantle boundary (CMB in the parlance of solid earth geophysicists) of the Earth lies between the planet's silicate mantle and its liquid iron-nickel outer core. This boundary is located at approximately 2891 km (1796 mi) depth beneath the Earth's surface. The boundary is observed via the discontinuity in seismic wave velocities at that depth due to the differences between the acoustic impedances of the solid mantle and the molten outer core. P-wave velocities are much slower in the outer core than in the deep mantle while S-waves do not exist at all in the liquid portion of
What We Do Is Secret (novel) What We Do Is Secret (novel) What We Do Is Secret is a novel by Thorn Kief Hillsbery, published by Villard in 2005. "What We Do Is Secret" takes place in Los Angeles in 1981, six months after the death of Darby Crash (lead singer of the Germs). It is narrated by a gay street kid named Rockets Redglare, who knew Darby personally. All the action occurs over the course of 24 hours, on Rockets' 13th birthday. Rockets was ten years old when he first met Darby Crash, lead singer of LA punk band the Germs. He and Darby had