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Sci. 4-3 The Theory of Plate Tectonics Pages 99-102

Understand the theory of Plate Tectonics, where Earth's lithosphere is divided into moving plates, driven by ridge push, convection, and slab pull. Explore convergent, divergent, and transform boundaries, and learn about the role of GPS in measuring plate movements.

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Sci. 4-3 The Theory of Plate Tectonics Pages 99-102

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  1. Sci. 4-3 The Theory of Plate Tectonics Pages 99-102

  2. A. Plate Tectonics- a theory that the Earth’s lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

  3. B. 3 Possible Causes of Plate Tectonics 1) Ridge Push- the process by which an oceanic plate slides down the lithosphere-asthenosphere boundary

  4. 2) convection- hot magma rises while cooler magma sinks since it is more dense. As it sinks, it heats up. As it rises, it cools. This is a continuous cycle. The motion of convecting mantle drags the plates.

  5. 3) slab pull- because oceanic lithosphere is denser than the asthenosphere, the edge of the oceanic plate sinks and pulls the plate with it.

  6. C. Plate Boundaries- 1) Convergent Boundary- 2 plates collide into each other

  7. a) mountains usually occur b) oceanic crust is denser than continental crust so it goes under when the 2 collide

  8. c) subduction zone- the area where oceanic crust sinks down into the asthenosphere

  9. 2) Divergent Boundaries- 2 plates pull apart from each other a) Mid Ocean Ridges are at divergent boundaries.

  10. 3) Transform Boundaries- 2 plates slide past each other a) often produces Earthquakes

  11. D. Global Positioning System (GPS)- a network of satellites used to measure the rate of tectonic plates movements

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