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
It'z Just What We Do It'z Just What We Do It'z Just What We Do is the second EP by American country music duo Florida Georgia Line. It was released in May 2012, by Big Loud Mountain. All five songs from the album later appeared on their debut studio album, "Here's to the Good Times" (2012). Jessica Nicholson of "Country Weekly" gave the album a very positive review, saying that "Newcomers Brian Kelley and Tyler Hubbard of Florida Georgia Line first met while students at Nashville’s Belmont University, and melded their diverse musical backgrounds to create their first five-song EP. No softhearted love songs here,