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 the Bleep Do We Know!? Do We Know!?—Discovering the Endless Possibilities of Your Everyday Reality". HCI president Peter Vegso stated that in regard to this book, "What the Bleep is the quantum leap in the New Age world," and "by marrying science and spirituality, it is the foundation of future thought." On August 1, 2006 "What the Bleep! Down the Rabbit Hole - Quantum Edition" multi-disc DVD set was released, containing two extended versions of "What the Bleep Do We Know!?," with over 15 hours of material on three double-sided DVDs. The film features interview segments of: What the Bleep Do We Know!? What the