Core–mantle boundary Core–mantle boundary The core–mantle boundary (CMB in the parlance of solid earth geophysicists) of the Earth lies between the planet's silicate mantle and its liquid iron-nickel outer core. This boundary is located at approximately 2891 km (1796 mi) depth beneath the Earth's surface. The boundary is observed via the discontinuity in seismic wave velocities at that depth due to the differences between the acoustic impedances of the solid mantle and the molten outer core. P-wave velocities are much slower in the outer core than in the deep mantle while S-waves do not exist at all in the liquid portion of
What the Bleep Do We Know!? Theater in Portland, Oregon, where it was filmed. Within several weeks, the film had appeared in a dozen or more theaters (mostly in the western United States), and within six months it had made its way into 200 theaters across the US. According to the makers of the film, "Bleep" is an expurgation of "fuck". William Arntz has referred to the film as "WTFDWK" in a message to the film's street team. The Institute of Noetic Sciences, a New Age research organization that "explores phenomena that do not necessarily fit conventional scientific models", has supported "What the Bleep Do We