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 in the Shadows (TV series) What We Do in the Shadows (TV series) What We Do in the Shadows is an upcoming American comedy television series based on the 2014 film of the same name that is set to premiere in 2019 on FX. "What We Do in the Shadows" is set in New York City and follows "three vampires who have been roommates for hundreds and hundreds of years." On January 22, 2018, it was announced that FX had given the production a pilot order. The series is set to be written by Jemaine Clement and directed by Taika Waititi both of whom are