Structure of the Earth the crust, upper mantle, lower mantle, outer core, and inner core. The geologic component layers of Earth are at the following depths below the surface: The layering of Earth has been inferred indirectly using the time of travel of refracted and reflected seismic waves created by earthquakes. The core does not allow shear waves to pass through it, while the speed of travel (seismic velocity) is different in other layers. The changes in seismic velocity between different layers causes refraction owing to Snell's law, like light bending as it passes through a prism. Likewise, reflections are caused by a large
We Do What We Want decision to write a heavier and more hardcore album than they had done in the past. Commenting on the band's evolved sound, bassist/vocalist Toby Morrell said, "I don't think we ever thought we'd get as heavy as we are now, but I'm glad we have." Though Shelton was not an active member of Emery during the writing process for "We Do What We Want", he wrote the final track on the standard edition titled "Fix Me," and the song "Crumbling" from the deluxe edition. Regarding the album's lyrical themes, vocalist Toby Morrell stated: In the month of March 2011, an