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Tectonics, Earthquake case study - Haiti (Haiti lies on the boundary of…
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Constructive
What? - Diverging away from each other
Where? - Eurasian and North American plates, East African rift valleyEarthquakes - Yes, not violent
Volcanoes - Yes, shieldPhysical Processes
- Hot molten magma rises between the plates.
- Plates move away from each other by ridge push and slab pull.
- The magma cools to form new plate.
Destructive
What? - Converging towards each other
Where? - The Pacific and Philippine platesEarthquakes - Yes, violent
Volcanoes - Yes, compositePhysical Processes
- When tectonic plates converge, pressure builds between them. The rock eventually fractures, causing earthquakes.
- When oceanic collides with continental, oceanic subducts into the mantle because it is denser. Here it melts.
- Hot magma can rise through the lithosphere and erupt as lava through volcanoes.
Conservative
What? - Sliding parallel to each other
Where? Pacific and North American platesEarthquakes - Yes
Volcanoes - NoPhysical Processes
- Pressure builds at the margin of the plates as they are pulled along behind a plate being subducted elsewhere.
- As friction is overcome, the rock fractures in an earthquake.
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