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
Call of Cthulhu: Dark Corners of the Earth of "Call of Cthulhu: Dark Corners of the Earth" was a commercial bomb, with sales slightly above 5,000 units by the end of 2005. Eurogamer's Kristan Reed called it among "the most disappointing" commercial performances of an Xbox game that year, and noted that it had been released "right in the thick of a busy release period to zero fanfare." "Call of Cthulhu: Dark Corners of the Earth" received generally favorable reviews, but was also often criticized for being buggy and inaccessible for many players because of its high difficulty. GameSpy ranked it as the tenth best game of E3