EESA06H3 Lecture Notes - Lecture 4: The Hot Spot, Rift Valley, Continental Crust
14 Feb 2016
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Eesa06- lecture 4- how continents break up and oceans are formed. Uniformitarianism present is the key to the past. Silica-rich continents are low density, therefore they are high. Igneous dikes: passages ways for magma and then flooding across the landscape. Failed rift: a rift that has not developed into an ocean (aulacogens) Failed rifts are moving just enough to result in earthquakes. Syria and jorden are being pushed to the north into turkey : due to the east african rift. Convection: hot rock rising, cold rock descending. What is happening in the core impacts the surface of the earth. Transform boundary= when plates are sliding past each other. It explains why we have islands in the middle of oceans: the hot spots are beating volcanoes and volcanoes start up as small on the ocean floor and once they grow they stick up as islands.
