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Intermission: Plate Tectonics. National Oceanic and atmospheric Administration/National Geophysical Data Center. Alfred Wegener. Evidence: (1) Continents Fit Together. Evidence: (2) Rocks & Structures Match Up. Evidence: (3) Glacial Features. Evidence: (4) Fossils. Pangea. Animation Link.

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Intermission plate tectonics l.jpg
Intermission:Plate Tectonics



Alfred wegener l.jpg
Alfred Geophysical Data CenterWegener


Evidence 1 continents fit together l.jpg
Evidence: Geophysical Data Center(1) Continents Fit Together


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Evidence: Geophysical Data Center(2) Rocks & Structures Match Up


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Evidence: (3) Glacial Features Geophysical Data Center


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Evidence: (4) Fossils Geophysical Data Center


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Pangea Geophysical Data Center


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Animation Link Geophysical Data Center


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“If we are to believe Wegener’s Hypothesis, we must forget everything which has been learned in the last 70 years and start over again.”–Critic of Continental Drift in 1928


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Harry forget everything which has been learned in the last 70 years and start over again.”Hess


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Evidence: Seafloor forget everything which has been learned in the last 70 years and start over again.”


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Seafloor Spreading forget everything which has been learned in the last 70 years and start over again.”


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Seafloor Age forget everything which has been learned in the last 70 years and start over again.”


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Seafloor Age forget everything which has been learned in the last 70 years and start over again.”


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Plate Tectonics forget everything which has been learned in the last 70 years and start over again.”


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Basic Plate Tectonics forget everything which has been learned in the last 70 years and start over again.”

  • Earth’s “surface” (lithosphere) is broken into plates

  • Plates move on asthenosphere

  • “Geology happens” where the plates interact with one another


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What do we mean by the Outer Part of the Earth? forget everything which has been learned in the last 70 years and start over again.”


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Three Layers: forget everything which has been learned in the last 70 years and start over again.”Based on Composition


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Crustal Properties forget everything which has been learned in the last 70 years and start over again.”


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Five Layers: forget everything which has been learned in the last 70 years and start over again.”Based on Physical Properties


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Part #1 forget everything which has been learned in the last 70 years and start over again.”of Plate Tectonics Definition

Earth’s “surface” is broken into rigid plates

Surface = Lithosphere

(includes

Continental Lithosphere and

Oceanic Lithosphere)


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Part #2 forget everything which has been learned in the last 70 years and start over again.”of Plate Tectonics Definition

Plates move…

…on the “plastic” Asthenosphere

…at about 1-10 cm/yr


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Part #3 forget everything which has been learned in the last 70 years and start over again.”of Plate Tectonics Definition

“Geology happens” where the plates interact with one another


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Earthquake Distribution forget everything which has been learned in the last 70 years and start over again.”


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Volcanoes and Plate Tectonics forget everything which has been learned in the last 70 years and start over again.”


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Part #3 forget everything which has been learned in the last 70 years and start over again.”of Plate Tectonics Definition

“Geology happens” where the plates interact with one another

How do they interact?

Pull Apart from one another (Diverge)(New rock is formed)

Push into one another (Converge)(Rock is destroyed)

Slide past one another(Rock is conserved)


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Divergent Boundary forget everything which has been learned in the last 70 years and start over again.”

Results in the formation of Oceanic Crust


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Examples: forget everything which has been learned in the last 70 years and start over again.”


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Transform Boundary forget everything which has been learned in the last 70 years and start over again.”


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Transform Example forget everything which has been learned in the last 70 years and start over again.”


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San Andreas Fault forget everything which has been learned in the last 70 years and start over again.”


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Convergent Boundary: Subduction forget everything which has been learned in the last 70 years and start over again.”

Melting Produces More Felsic Magma

Results in the formation & growth of Continental Crustand destruction of Oceanic Crust


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Example: forget everything which has been learned in the last 70 years and start over again.”Pacific Northwest


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Example: forget everything which has been learned in the last 70 years and start over again.”Andes Mountains


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Convergent Boundary: Collision forget everything which has been learned in the last 70 years and start over again.”

Results in the growth of Continental Crust


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Basic Plate Tectonics - Revised forget everything which has been learned in the last 70 years and start over again.”

  • Earth’s lithosphere is broken into 12-24 rigid plates

  • Plates move about 1-10 cm/yr on the plastic Asthenosphere

  • “Geology happens” where the plates interact with one another along Divergent, Transform, Subduction and Collisional Boundaries


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What Drives Plate Tectonics? forget everything which has been learned in the last 70 years and start over again.”

Internal Heat


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Convection Models forget everything which has been learned in the last 70 years and start over again.”


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Set the “Wayback Machine” to return to the Hadean… forget everything which has been learned in the last 70 years and start over again.”

Return to Hadean ppt