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8.2 Plate Boundaries

8.2 Plate Boundaries. Divergent Boundaries. What is a divergent boundary? A boundary b/t two lithosphere plates that are moving apart. Most exist on the ocean floor and have rift valleys (deep valleys at the center of mid ocean ridges)

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8.2 Plate Boundaries

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  1. 8.2 Plate Boundaries

  2. Divergent Boundaries What is a divergent boundary? • A boundary b/t two lithosphere plates that are moving apart. • Most exist on the ocean floor and have rift valleys (deep valleys at the center of mid ocean ridges) • Rifts - Where molten rock forces its way b/t cracks on ocean floors causing spreading (sea floor spreading)

  3. Divergent Boundary

  4. Convergent Boundaries What is a convergent boundary? • It is where two plates come together or “converge”. Types • When a plate dives beneath another plate is called a subduction boundary.

  5. Convergent Boundary Products of Subduction boundaries - Deep Sea Trench – It is a part of a subduction boundary that is the deepest parts of the ocean floor.

  6. ***NOTE*** When two oceanic plates converge, trench formation is accompanied by the formation of a volcanic island arc.

  7. Convergent Boundaries Types Collision Boundaries: • Where two continental plates collide. May cause continents to weld. Mountain formation occurs at point of collision • Ex. Himilayas (China/India), Ural Mtn (Siberia/Europe)

  8. Transform Boundaries Transform Boundaries – is the product of two plates sliding past each other. Earthquakes

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