EESA06H3 Final: Exam Study Guide (every year the course material varies)
Document Summary
Plates are pushed around the surface over a weak layer called asthenosphere: can either be separated at spreading centres hot mantle erupts to form oceanic crust, places also collide one is pushed below another to be recycled back into the mantle along subduction zones causing active volcanoes and earthquakes, when they slide past each other its called transform plate boundaries, continental collision are also preserved in the geologic record as suture zones, terrane boundaries and mountain ranges. Wegener reconstructed old climate zones: determined that the ancient poles were in different positions than the present poles (cid:131) he called this process polar wandering (cid:131) what was theorized then was that the poles had moved and the continents had drifted (cid:131) since his ideas were not clear cut many of his theories were no accepted and other ways to explain such phenomena were use.
