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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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Presentation Transcript
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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

basic plate tectonics
Basic Plate Tectonics
  • Earth’s “surface” (lithosphere) is broken into plates
  • Plates move on asthenosphere
  • “Geology happens” where the plates interact with one another
part 1 of plate tectonics definition
Part #1of Plate Tectonics Definition

Earth’s “surface” is broken into rigid plates

Surface = Lithosphere

(includes

Continental Lithosphere and

Oceanic Lithosphere)

part 2 of plate tectonics definition
Part #2of Plate Tectonics Definition

Plates move…

…on the “plastic” Asthenosphere

…at about 1-10 cm/yr

part 3 of plate tectonics definition
Part #3of Plate Tectonics Definition

“Geology happens” where the plates interact with one another

part 3 of plate tectonics definition31
Part #3of 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)

divergent boundary
Divergent Boundary

Results in the formation of Oceanic Crust

convergent boundary subduction
Convergent Boundary: Subduction

Melting Produces More Felsic Magma

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

convergent boundary collision
Convergent Boundary: Collision

Results in the growth of Continental Crust

basic plate tectonics revised
Basic Plate Tectonics - Revised
  • 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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