Structure of the Earth discontinuity (a second order discontinuity). The uppermost mantle together with the crust constitutes the lithosphere. The crust-mantle boundary occurs as two physically different events. First, there is a discontinuity in the seismic velocity, which is most commonly known as the Mohorovičić discontinuity or Moho. The cause of the Moho is thought to be a change in rock composition from rocks containing plagioclase feldspar (above) to rocks that contain no feldspars (below). Second, in oceanic crust, there is a chemical discontinuity between ultramafic cumulates and tectonized harzburgites, which has been observed from deep parts of the oceanic crust that have been
Bones of the Earth the team speculated that dinosaur migration might be similarly controlled by the song of the Earth, the song of tectonic plates shifting in the crust of the planet. And the possibility of the Chicxulub meteor having been so great as to detune the song of the Earth for a decade or a century, deafening the dinosaurs so they could not migrate, causing them to starve. In the end, the evolved avians decide to retroactively remove the time travel science from human hands, thereby rendering all of the events up to that point irrelevant. But, out of the ashes of this