EES 1030 Lecture 3: Lecture 3 1:24:17 Earth Science
11 May 2017
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Document Summary
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. But is thinner than continental crust approximately 7-10 km thick. Composed of basalt and gabbro older and colder accommodates pressure by either overriding or subducting. Thicker than oceanic crust at least 25 km but up to 70 km thick. Nazca plate subducting under the south american plate. Andes are longest continental mountain range in the world approximately 7000 km long. How we get mountains: we collide plates with each other, we subduct lithosphere, generating volcanic mountain ranges.
