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 Secret What We Do in Secret What We Do In Secret is an American Christian hardcore band from Memphis, Tennessee. They have toured with bands such as War of Ages, Phinehas, Silent Planet, Sleepwave, We Came As Romans, '68, For Today and Norma Jean. They have released two EPs. What We Do In Secret was formed in Memphis in March 2012 by Josh Adams, Drew Nance, Devin Harris and Nathan Moody. They recorded their first EP, "New Eyes", and released it on August 31, 2013. Moody left the band after this and was replaced by Clay Crenshaw and Austin Barnes. The