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Transcript of Plate Tectonics
Evidence for Continental Drift
Shape of the Continents
East Pacific Rise
Isochron Map of Ocean-Floor Crust
The Mechanism TO Support Continental Drift
1500's Dutch Mapmaker
Noticed the fit of continents
Hypothesized present continents had once been joined as a single landmass named Gondwanaland
Continental Drift Hypothesis
Wegner's hypothesis: Earth's continents were joined as a single landmass, called Pangaea, that broke apart 200 million years ago and slowly moved to their present positions.
Greek for "all the Earth"
Broke apart about 200 million years ago
Types of Plate Boundaries
Wegener hypothesized that there should be areas of similar rock types on opposite sides of the Atlantic Ocean.
Appalachian Mountains shared similar features with rocks in Greenland and Europe.
Convergent- plates move
Divergent- Plates move
from each other
Three Types of Convergent Boundaries
Japanese Island Arc
Andez Mountain Range
Seafloor Spreading Center
Rift Valley East Africa
Ocean Floor Topography
A subduction zone forms when one oceanic plate, which has become denser as a result of cooling, descends below another plate.
Causes of Plate Motion
Convection currents transfer thermal energy in unequally heated matter