EESA06H3 Lecture Notes - Lecture 4: Convergent Boundary, Continental Crust, Lava Lamp
4 Apr 2018
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Igneous rocks produced from magma stuffed full of silica that"s why we have contents because happen to be buoyant and float (igneous rocks) And by chemical composition (how much silica?) Aphanatic- size of crystal small fine grained. Lots of silica lighter, less=heavier: silicate structure and its effect on magma viscosity: check chapter 6 wont be on exam: Failed rifts are preserved in modern continents from the break up of pangea. Failed rifts tend to thick up with segments: earth quakes occur in the middle of plates because of failed rifts. 1811 and 1886 powerful examples of inter-plate earthquakes. Potentially more dangerous than regular earthquakes: east african rift: Birthplace of a new ocean and a cradle of humans. Horsts (high) and grabens (lows: shield volcano. Because magma is flowing down very easy. Creates a collision zone of high mountains. Made of deformed oceanic rocks from western europe to asia. Transform fortes dead sea is a rift along transform forte.
