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 We Do in the Shadows What We Do in the Shadows A documentary crew (who are wearing crucifixes) follows four vampire roommates—Viago, Vladislav, Deacon, and Petyr—who share a flat in the Wellington suburb of Te Aro. Although Viago, Vladislav and Deacon are all several centuries old, they have retained normal human appearances, but the 8,000-year-old Petyr resembles Count Orlok and acts more savagely than the younger vampires. Each night, Viago, Vladislav, and Deacon prowl the streets of Wellington searching for people to kill, but they must stay in the flat during the day to avoid sunlight—which is lethal to vampires—and thus have not adapted to