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  • 1. A. Part of the Earth that consists of several large and several small tectonic plates. B. Movement of a fluid due to temperature difference. C. Supports the Theory of Plate Tectonics. D. Pulling the edge of some plates towards the center of the Earth. E. A theory that states the Earth’s surface consists of large moving plates. 1. Plate Tectonics 2. Gravity 3. Lithosphere 4. Sea Floor Spreading 5. Convection Current E D A C B
  • 2. ReviewReview Plate Tectonics Deep sea trenches Mid oceanic ridges Sea floor spreading
  • 3. EarthquakesEarthquakes A shaking of the earth’s crust due to a release of energy
  • 4. OccurrencesOccurrences More than 3 million occur each year About 8,000 per day, or 1 every 11 seconds Most are extremely weak There are three major earthquake zones:
  • 5. 1. The Ring of Fire1. The Ring of Fire
  • 6. 2. Mid Ocean Ridges2. Mid Ocean Ridges
  • 7. 3. Eurasian – Melanesian Mountain Belt
  • 8. Major Earthquake ZonesMajor Earthquake Zones Most earthquakes occur along the edges of the earth’s lithospheric plate boundaries
  • 9. BoundariesBoundaries Divergent: Two plates are moving away from each other Sea floor spreading
  • 10. BoundariesBoundaries Convergent: Two plates are colliding
  • 11. BoundariesBoundaries Subducting: On plate is forced under another This is a type of convergent boundary!
  • 12. Subduction zone Pacific Plate South America Andes Mountains
  • 13. BoundariesBoundaries Transform boundary: Sliding by one another Not creating or destroying land