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Plate Tectonics

Learn about plate tectonics, divergent, convergent, and transform boundaries, and their associated geological features like rift valleys, mountain ranges, and earthquakes.

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Plate Tectonics

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  1. Plate Tectonics Plate Boundaries and Interactions

  2. The Theory of Plate Tectonics • The Earth’s surface is divided into plates that move and interact with one another.

  3. Overview of Plate Boundary Interactions

  4. 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.

  5. Examples found on Earth: Mid-Atlantic Ridge, African Rift Valley, Iceland

  6. 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.

  7. Examples found on Earth: Himalayas, Pacific Ring of Fire, Andes Mountains, Marianas Trench

  8. 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

  9. Plate Boundaries, Earthquakes and Volcanic Activity

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