- Ur-Continents
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Continental Drift
- Pioneer
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Vocab
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Plate
- Pieces of crust containing continent or ocean sliding on liquid rock
- Continents are not plates exactly
- Earths Layers
- Convection in the Mantle
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Dualism of Plates
- Continental Plate
- Sea Plate
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Two plates meet, what happens?
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Convergence
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Collision
- Mountain Building
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Subduction
- Moving underneath
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Divergent
- Rifting
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Seafloor Spreading
- a specific type of rifting happening between oceanic plates
- Mid-Atlantic ~ 2.5cm per ear
- East Pacific Rise
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Transform
- When two plates move in opposite directions aside one another
- causes earthquakes
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Volcanos
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Subduction Zones
- everything is still moving and influencing it from the center.
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Volcano Eyk...
- Shot ash into the jet stream
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Hot Spots
- Places in the seafloor crust where magma rises
- there is a weakness in the upper plate that causes it to erupt
- Fault Zones
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Major Time Periods
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Geologic Time
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Pangea Closest Super Continent
- Triassic: Mammals & Dinosaurs
- 30 mya the plants came to be wehere they are now
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Paleoclimate
- Looking at fossils we can conjecture what the climate was on pangea
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Evidence
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Fossils
- Animals
- Plant Fossils
- Movement of plates now
- Paleomagnetism
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New World Primates
- How to relate old world and new world primates.
- We have evidence for raft theory of rats
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Modern Effects
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Himalayas
- Collided with the Eurasian plate
- Ideally, not of the continent is subducted
- grows about 5mm a year
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Ring of Fire
- 2/3s fo the world's active volcanos
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Earthquakes
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California Earthquake
- Transform boundary
- San Andreas Fault
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Old Faithful
- Rising magma and heat encounter ground water
- Ground water is super-heated
- 90 minute intervals
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Future?
- A di-continental configuration