New Information for PY106. Class meets daily in SCI 111 from 9:00 to 10:30 a.m. NEW! Problems 38 and 64 of the chapter 24 assignment (which is due Wednesday, August 2) will be due at the start of class on Thursday, August 3. The rest of this assignment is still due at the usual time (at the start of discussion section on Wednesday, August 2). Concerning labs: The first lab will take place on Thursday, July 6, from 10:30 to 1:00 in the basement of SCI. Both lab sections, A and B, will meet at this time.
Oceanic crust is the uppermost layer of an oceanic tectonic plate. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together comprise an oceanic plate.The plates of the Earth together are referred to as the lithosphere.Oceanic crust is the result of erupted mantle material originating from below the plate, cooled and in most instances, modified chemically by seawater.This occurs mostly at mid-ocean ridges, but also at scattered hotspots, and also in rare but powerful occurences known as flood basalt eruptions.he crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together comprise an oceanic plate. The plates of the Earth together are referred to as the lithosphere.
This is similar to oceanic-continental convergence in that one of the plates is subducted under the other during the collision. At the subduction zone a very deep trench is formed in the ocean floor. Oceanic and oceanic plate convergence result in the formation of volcano chains. The crust that is pulled under or subducted melts to form magma. This magma rises to the top of the overriding oceanic plates and erupts on the ocean floor.