Ch05_Outline - Chapter5 PlateTectonics:A ScientificTheory...

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 Chapter 5  Plate Tectonics: A  Scientific Theory  Unfolds
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        Continental Drift: An Idea  Before Its Time Alfred Wegener First proposed his continental drift  hypothesis in 1915  Published  The Origin of Continents  and Oceans Continental drift hypothesis   Supercontinent called  Pangaea  began  breaking apart about 200 million  years ago  
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      Pangaea Approximately 200  Million Years Ago Figure 5.2 A
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      Continental Drift: An Idea  Before Its Time Continental drift hypothesis Continents "drifted" to present  positions   Evidence used in support of  continental drift hypothesis   Fit of the continents  Fossil evidence Rock type and structural similarities    Paleoclimatic evidence 
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      Matching  Mountain Ranges Figure 5.6
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    Paleoclimatic Evidence Figure 5.7
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        The Great Debate Objections to the continental drift  hypothesis  Lack of a mechanism for moving  continents  Wegener incorrectly suggested that  continents broke through the ocean  crust, much like ice breakers cut  through ice  Strong opposition to the hypothesis  from the scientific community
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    The Great Debate Continental drift and the scientific  method Wegener’s hypothesis was correct in  principle, but contained incorrect  details  A few scientists considered Wegener’s  ideas plausible and continued the  search 
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    Plate Tectonics: A Modern  Version of an Old Idea Earth’s major plates   Associated with Earth's strong, rigid  outer layer Known as the  lithosphere Consists of uppermost mantle and  overlying crust Overlies a weaker region in the mantle  called the  asthenosphere   
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    Plate Tectonics: A Modern  Version of an Old Idea Earth’s major plates Seven major lithospheric plates Plates are in motion and continually  changing in shape and size Largest plate is the Pacific plate Several plates include an entire  continent plus a large area of seafloor  
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    Earth’s Plates Figure 5.9  (left side)
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    Earth’s Plates Figure 5.9 (right side)
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This note was uploaded on 09/14/2011 for the course EAS 120 taught by Professor Svec during the Fall '08 term at Moraine Valley Community College.

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Ch05_Outline - Chapter5 PlateTectonics:A ScientificTheory...

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