EES 1030 Lecture 3: Lecture 3 1:24:17 Earth Science

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Earth & Environmental Sciences
EES 1030
John Adrain

Tuesday, January 24, 2017 Lecture 3 Earth Science: Plate Tectonics Cont. Plate Boundaries Three different kinds of boundaries Convergent (compressional) destructive two plates move towards each other makes crust in the area shorter: where we recycled old crust Divergent (tensional) Creative (new crust forms) plates move away from each other Transform (sliding past) Conservative (no new material, none taken away) plates slide past each other Two different kinds of crust: oceanic and continental, and one plate can have both kinds of crust Oceanic vs. Continental Crust Oceanic Crust Dense 3.2 gcm 3 But is thinner than continental crust approximately 710 km thick Composed of basalt and gabbro older and colder accommodates pressure by either overriding or subducting Continental Crust Less dense 2.7gcm3 1
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