5-Plate tectonics

5-Plate tectonics - Where are earthquakes (yellow dots)...

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Where are earthquakes (yellow dots) located relative to main features of Earth ` s surface? Mid-ocean ridges Trenches Mountain belts LG2
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Where are active volcanoes (orange triangles) located relative to main features of Earth ` s surface? Mid-ocean ridges (not all shown) Mountain belts next to trenches Red Sea and East Africa LG2
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Earth ` s surface can be divided into l plates z on the basis of tectonic activity Earthquakes, volcanism, and/ or mountain building = tectonic activity Belts of tectonic activity divide lithosphere into tectonic plates LG3
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How are those l plates z structured below the Earth ` s surface (i.e., in a cross section)? ?????????????????????????????????????? ??????????????????? LG4
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Each tectonic plate behaves as single unit and interacts with other plates in three possible ways. Move apart: divergent boundary Move toward each other: con vergent boundary Move horizontally past one another: transform boundary
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Three layers are depicted here (maybe four?) what are they? Move apart: divergent boundary Move toward each other: con vergent boundary Move horizontally past one another: transform boundary
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Continental crust Oceanic crust Mantle Earth can be divided into layers of different composition : Core Mantle Crust
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Continental crust Oceanic crust Mantle Why are there two kinds of crust? How do they differ? Can continental crust have ocean on top? Continental shelf
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Compositional layers of Earth differ in their amounts of Silicon (Si) and Iron (Fe). Core : nearly all Fe Density = 12-15 gm/L Mantle : Silicate rocks high in Fe Density = 3.4 to 5.6 gm/L Continental crust: Si- rich, Fe-poor rocks Density = 2.8 gm/L Oceanic crust: Rocks intermediate in Fe composition Density = 3.2 gm/L
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ASTHENOSPHERIC MANTLE: Mostly solid (>98%), very hot, weak = flows under pressure LITHOSPHERIC MANTLE: Strong = breaks under pressure, attached to overlying crust. ASTHENOSPHERIC MANTLE LITHOSPHERIC MANTLE CONTINENTAL CRUST OCEANIC CRUST LITHOSPHERE = strong, rigid part of Earth = tectonic plates Layers of the upper Earth can also be divided based on how they behave under pressure: whether they tend to break or flow.
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A B C D crust Lithospheric Mantle Asthenospheric mantle rest of the upper mantle Lithosphere - rigid Asthenosphere – solid, but so hot that it will flow. Thus far weaker than the lithosphere Earth Layers (Cross section of the Earth ` s crust and upper mantle) LG4
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How are those l plates z structured below the Earth ` s surface (i.e., in a cross section)? Cross section has to depict how l plates z on surface relate to the crust, lithospheric mantle and asthenosphere LG4
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How are those l plates z structured below the Earth ` s surface (i.e., in a cross section)? Fill in cross section to depict how
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This note was uploaded on 12/01/2011 for the course GEO 101 taught by Professor Andreabair during the Fall '11 term at Central Mich..

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5-Plate tectonics - Where are earthquakes (yellow dots)...

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