Structure of the Earth easily than does the upper mantle (chemical changes within the mantle may also be important). The viscosity of the mantle ranges between 10 and 10 Pa·s, depending on depth. In comparison, the viscosity of water is approximately 10 Pa·s and that of pitch is 10 Pa·s. The source of heat that drives plate tectonics is the primordial heat left over from the planet’s formation as well as the radioactive decay of uranium, thorium, and potassium in Earth’s crust and mantle. The average density of Earth is . Because the average density of surface material is only around , we must
What We Do Is Secret (film) Campos from Film Threat said that "These actors and many more make "What We Do Is Secret" an absolute blast to watch and they do an undeniably perfect job of recreating this notorious scene." "What We Do Is Secret" was released on DVD on November 4, 2008. In addition to "Forming", which appears on the soundtrack album, the team of Shane West, Bijou Phillips, Lukas Haas, and Michael LeBlanc also perform the Germs songs "Circle One", "Lexicon Devil", "Richie Dagger's Crime", "Shut Down (Annihilation Man)", and "Lion's Share" in the film. The Bronx also performs the Black Flag song "Police