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
Between the Earth and the Stars Between the Earth and the Stars Between the Earth and the Stars is the debut album of American country music singer Jeff Wood. It was released on February 11, 1997 through Imprint Records. The album includes the singles "You Just Get One", "Use Mine" and "You Call That a Mountain". "You Just Get One" was originally recorded by Ty Herndon on his 1995 debut "What Mattered Most", and B. J. Thomas later released his version of "You Call That a Mountain" in 2000 from his album of the same name. Billy Hoffman also recorded the song on his 2000 album