Lecture 5 - Plate Boundaries- Most dynamic geological...

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Unformatted text preview: Plate Boundaries- Most dynamic geological activity takes place at plate boundaries- Where volcanoes and earthquakes occur- Australia = primary area of early fossil evidence bc it is tectonically quiet (meaning a lot of old stuff hasnt been messed around, so it is good for studying the early life) Ocean Convergence- ocean crust same density how does it subduct? ocean plate always subduct under continental - age-temperature older and cooler ocean plate (more dense) always subduct under younger one- formation of volcanic island arcs and back are basins Transform Boundaries- plates move past each other with no net formation or destruction of material (causing small earthquakes )- zones of great Strike Slip Fault Activity - ex: San Andreas Fault: Pacific/N-American Plates, also MORs Early Oceans, Early Atmosphere, Early Life Early Origins- Big Bang (12-14 bil. Yrs ago)- solar system and the earth: 4.6 bil hypothesis: early solar system form in large dust clouds rotating spinning collapsing clouds of...
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This note was uploaded on 03/20/2010 for the course EOSC 116 taught by Professor Randell during the Winter '09 term at The University of British Columbia.

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Lecture 5 - Plate Boundaries- Most dynamic geological...

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