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Chapter Four Summary

by: Alexandra Grese

Chapter Four Summary Earth Science 1100

Alexandra Grese
GPA 3.0
Planet Earth
Cristina Millan

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About this Document

Lecture and powerpoint presentation translated into note form.
Planet Earth
Cristina Millan
Class Notes
Chapter four, Earth Science, notes, summary
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This 2 page Class Notes was uploaded by Alexandra Grese on Monday February 9, 2015. The Class Notes belongs to Earth Science 1100 at Ohio State University taught by Cristina Millan in Winter2015. Since its upload, it has received 36 views. For similar materials see Planet Earth in Earth Science at Ohio State University.


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Date Created: 02/09/15
Alexandra Grese Chapter Four Summary Plate Tectonics o Unifying theory 0 Relatively new 0 Evolved and improved through time 0 Alfred Wegener I Continental drift Fit of continents Glacial deposits Paleoclimatic belts Distribution of fossils Matching geologic units I Super continent explains all Ridiculed and ignored because couldn t explain the force driving it all New evidence in the 1950 s and 60 s 0 Elegant explanation for how earth works I Outer shell broken into rigid plates that move So the face of the earth can change I Explains rock types where and why 0 Divergent Boundaries I Sea oor spreading I Tectonic plates move apart I Magma wells up to form new sea oor I Ocean basin forms Age of ocean greater away from center I MidOcean Ridge underwater mountain ranges rising from asthenosphere to form oceanic crust o Convergent Boundaries I Plates come together Oceanic subducts Trench deepest part of ocean oor where plates subduct Volcanic arc chain of volcanoes overriding plate Accretionary prism deformed sediment wedge o Sediment scraped off subducting plates that forms a prism that is sometimes pushed above sea leavel o Transform I Plates slide sideways I Earthquakes but no volcanoes I midocean ridge set of by transform boundaries 0 Triple junction point where three boundaries intersect o Oceanic I Created at midocean ridge destroyed by subduction zones 0 Continental I Torn apart at rifts I Ioined during collision 0 Driving Mechanism I Old idea plates dragged atop convecting mantle I New idea convection slab pull and ridgepush 0 Plate tectonics key to understanding geology I Mantle transferred to surface then back down again I Interior and surface in constant motion


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