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Plate Boundaries and Interactions
Plate Tectonics Plate Boundaries and Interactions
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The Theory of Plate Tectonics
The Earth’s surface is divided into plates that move and interact with one another.
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Overview of Plate Boundary Interactions
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Divergent Plate Boundaries
Plates are moving apart. New crust and lithosphere is “created” Associated with ocean ridges, rift valleys, volcanism, earthquakes and high heat flow.
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Examples found on Earth: Mid-Atlantic Ridge, African Rift Valley, Iceland
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Convergent Plate Boundaries
Plates are moving towards each other. Old crust and lithosphere is “recycled”. Associated with ocean trenches, island arcs and mountain ranges. Earthquakes and volcanism are common.
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Examples found on Earth: Himalayas, Pacific Ring of Fire, Andes Mountains, Marianas Trench
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Transform Plate Boundaries
Plates slide past each other, oftentimes connecting two ridges or trenches. Crust is deformed or fractured; Lithosphere is neither created nor recycled. Long faults and earthquakes common. Examples found on Earth: San Andreas Fault
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Plate Boundaries, Earthquakes and Volcanic Activity
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