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
The Not-Its! that just happen to be about every-day kid stuff (the first day of school, taking a bath)." The Not-Its! released their first full-length album, "We Are The Not-Its!" in July 2009. The album later received a Fids & Kamily music award for one of the best children's music albums of 2009. They have received numerous rave reviews in both local and national press, including upscale mom publication Cookie Magazine, Seattle Magazine and the Seattle Times , as well as on blogs and websites such as zooglobble.com , Spare the Rock, Spoil the Child, and coolmompicks.org. They were also recently selected