GEOL 100 Lecture Notes - Lecture 17: Juan De Fuca Ridge, East Pacific Rise, Convergent Boundary
Document Summary
Some plate are under the oceans, some are under continents, some are under both. They are broken up by boundaries and constantly in motion because they float around on top of the bendy asthenosphere. Divergent boundaries: when plates move away from each other. of the split the space. Oceanic plate separation: as the plates separate, magma rises up to fill. Mid-ocean ridge: the two rough ridges that are left on either side. These are much higher up because hot rocks rise and the cool rocks (further and further away from the split) sink down. Rift valley: the lower valley of new lithosphere that is left between. Seafloor spreading: the addition of new seafloor to this valley as. Decompression melting: the earth"s mantle moves up at the area of the split. The lithosphere melts due to reduced pressure, and the asthenosphere moves up because it has low velocity the plates continue to move them.
