Theory of Plate Tectonics: Lithosphere is broken up into many plates that move Lithosphere is broken...
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![Page 1: Theory of Plate Tectonics: Lithosphere is broken up into many plates that move Lithosphere is broken up into many plates that move Interactions when the.](https://reader035.fdocuments.us/reader035/viewer/2022070409/56649e9d5503460f94b9de1a/html5/thumbnails/1.jpg)
Theory of Plate TectonicsTheory of Plate Tectonics:
• Lithosphere is broken up into many plates that move
• Interactions when the plates touch, explain most of the Earth’s land and ocean features
• Earthquakes can occur at all plate boundaries
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Plate BoundariesTransfor
m
Divergent
Convergent
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What happens at a divergent boundary?• Motion: Plates moving apart
• Features/Processes: o Sea floor spreadingo Mid-ocean ridgeo Volcanic activity
Ex: Mid-Atlantic Ridge
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Ex: The Great Rift Valley • Divergent
boundary on a continent
• New ocean forming
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DivergBound_PC
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What happens at a transform boundary?
• Motion: Plates slide past each other
• Features/Processes: Many earthquakes
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Ex: San Andreas Fault
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What happens at a convergent boundary?• Motion: Plates
are pushed together
• Features depend on which types of plates are converging (details below)
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Convergent(oceanic crust vs. continental
crust)• Oceanic subducts under continental because…o The oceanic crust has a greater density
• Trench is created off the coast• Volcanic Mountains created on land due to rising
magma
magma
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Ex: The Andes Mountains
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Convergent(oceanic crust vs. oceanic
crust)• The OLDER oceanic plate will sink beneath the newero The older plate is denser b/c it has more time to
compact • Trench is created in between the plates• A volcanic island arc is created due to rising magma
mag
ma
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Examples: Island Arcs of1. Aleutian Islands, Alaska 2. Japan
3. The Philippines
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Convergent(continental vs. continental)• Both plates collide and deform
o neither subducts because both plates have similar, low densities
• The crust thickens as mountains are pushed upwardo metamorphism of rocks takes place from
pressure
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Ex: The Himalayas
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ConvergMargV2
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MotionAtPlate_PC