EARTH PROC & ENVIR
EARTH PROC & ENVIR GEOL 1121
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This 1 page Class Notes was uploaded by Sabina Okuneva on Saturday September 12, 2015. The Class Notes belongs to GEOL 1121 at University of Georgia taught by Staff in Fall. Since its upload, it has received 48 views. For similar materials see /class/202261/geol-1121-university-of-georgia in Geology at University of Georgia.
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Date Created: 09/12/15
GEOL 1 121 Outline of Video Plate Dynamics quotom the Earth Revealed Series INTRODUCTION Crustal quotagments separate collide and move past each other rearranging and deforming the surface of the Earth Plates are rigid slabs that form the outer layer of the Earth Plate interiors are relatively inactive Plate boundaries see most of the action volcanism rising mountains deep sea trenches Most plates have sections of continental and oceanic crust but some of them are entirely oceanic There are three main types of plate boundaries divergent boundaries boundaries transform boundaries DIVERGENT BOUNDARIES Characteristics rifts shallow earthquakes geysers and hot springs basaltic lava ows out of Examples Iceland a midoceanic ridge exposed at the surface the Rift Valley of Africa a new ocean will ll the valley the a young ocean that will grow wider Divergent boundaries are places where two plates move apart and oceanic crust is created along i i ridges by prearlino CONVERGENT BOUNDARIES Plates grow larger by sea oor spreading but the Earth s volume therefore there have to be places where plates are reduced in size CONVERGENT BOUNDARIES At convergent boundaries two plates come together Plates are destroyed along where one plate slips beneath the other in the process called subduction Subduction carries rocks deep into the Earth where temperature and pressure are enough to melt them Molten rock rises and reacts with overlying rocks forming a volcanic system at sea or a volcanic arc on land above subduction zones
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