10F_b_Tectonics_i - Mt.Sinabung Sumatra,Indonesia ~200Ma (alllands ContinentalDrift Evidence Fig 16.6 Problem Wegenercontine

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Mt. Sinabung Sumatra, Indonesia
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Continental Drift Alfred Wegener - early 1900s Continents to move - all together ~200 Ma  supercontinent of Pangaea (“all lands”)
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Evidence Fig. 16.6
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Explanations used to explain animal habitat distributions
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Problem: How did continents move ? Wegener  -  continents plowed through the oceans and that  movement was related to earth rotation and gravitational  pull of the moon Ideas were widely criticized and opposed
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New technology applied to exploring ocean basins Better understanding of Earth’s interior Revolution in 1960s more comprehensive version -  Plate Tectonic theory now widely accepted
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“The crust of the earth must be a shell floating on a fluid interior. Thus  the surface of the globe would be capable of  being broken and disordered  by the violent movements of the fluids on which it rested.” Benjamin Franklin, 1782 Plate Tectonics “the unifying theory”
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Plate Tectonics What are the plates? How they move? How do they interact with each other? What are the results of these interactions? What drives plate movement?
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Plate tectonics  - Earth’s behavior caused by formation, destruction, movement, and interaction  of large rigid plates at the Earth’s surface  
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Crust, mantle, core are  compositional layers       
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Plates   controlled by mechanical layers Mechanical layers defined by behavior when force is applied weak vs. strong layers
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“lithos” = stone “asthenes” = weak Plates made up of -  Lithosphere   - outermost rigid mechanical layer of the earth consists of  averages ~100 km thick (~1.5% of radius)
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This note was uploaded on 02/19/2011 for the course GLY 1000 taught by Professor Vogl during the Spring '08 term at University of Florida.

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10F_b_Tectonics_i - Mt.Sinabung Sumatra,Indonesia ~200Ma (alllands ContinentalDrift Evidence Fig 16.6 Problem Wegenercontine

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