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Plate Tectonics

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Ann Gamboa

on 21 October 2017

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Transcript of Plate Tectonics

Plate Tectonics
Continental Drift
Evidence for Continental Drift
Rock Formations
Shape of the Continents
Fossil Evidence
Sonar- echo-sounding
Seafloor Spreading
East Pacific Rise
Magnetic Reversals
Isochron Map of Ocean-Floor Crust
The Mechanism TO Support Continental Drift
Plate Boundaries
Earth's Layers
Abraham Ortelius
1500's Dutch Mapmaker
Noticed the fit of continents
Eduard Suess
Austrian Geologist
Late 1800's
Hypothesized present continents had once been joined as a single landmass named Gondwanaland
Early 1900's
Alfred Wegner
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.
Continental Drift
Greek for "all the Earth"
Broke apart about 200 million years ago
German Scientist
Rock Formations
Rock Formations
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
each other
Divergent- Plates move
from each other
Transform- Plates
slip past
each other
Three Types of Convergent Boundaries
Convergent Boundary
Divergent Boundary
Transform Boundary
Himalayan Mountains
Japanese Island Arc
Andez Mountain Range
Seafloor Spreading Center
Rift Valley East Africa
Ocean Floor Topography
Black Smokers
Red- Volcanism
Blue- Earthquakes
Subduction Zone
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
Convection Cells
Unanswered Questions?
Convergent Zone
Full transcript