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Vocabulary

Vocabulary. Plate tectonics . convection. Light/less dense Heavy, denser. Hot cold. c onvection. Define Draw a pic. convection. Why? Density differences (less dense rises, denser sinks) Less dense (warmer) more dense (colder). c onvection. what is causing convection ?

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Vocabulary

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  1. Vocabulary Plate tectonics

  2. convection

  3. Light/less dense • Heavy, denser • Hot • cold convection

  4. Define • Draw a pic convection

  5. Why? • Density differences (less dense rises, denser sinks) Less dense (warmer) more dense (colder) convection

  6. what is causing convection? • what is causing the air to heat up? • The sun is a heat source. why does convection happen?heat source

  7. Where does convection occur? • Water • Air • Mantle • Sun University of Wisconsin – Green Bay

  8. convection

  9. What is convection transferring? • Convection transfers heat & energy by movement through fluids (gas, liquids) convection

  10. Lithos • stone, rock • Crust + upper part of upper mantle • Rigid, brittle lithosphere

  11. Plates (tectonic plate) • Ex: North American plate, Pacific plate, Juan de Fuca plate, etc. lithosphere

  12. DEFINITION LITHOSPHERE

  13. Astheno • weak, soft • rock asthenosphere

  14. Zone of weak, soft rock • Plastic-like • Lithosphere (plates) float on top asthenosphere

  15. DEFINITION • DRAW LITHOSPHERE & ASTHENOSPHERE ASTHENOSPHERE

  16. Place (zone) where the plate descends • Cold, denser plate • Convergent boundary subduction

  17. definition • Simple drawing SUBDUCTION

  18. Slab push • Divergent boundary, seafloor spreads, mid-ocean ridge • Slab pull • cold, dense plate subducting & pulls the plate into the subduction zone • Draw simple diagram Slab push/pull

  19. Slab push/pull

  20. Theory of Plate Tectonics • Plates are in constant motion • ~20 plates • driven by convection currents in the mantle • Move few cm per year

  21. Density differences: “wax on–wax off” circular motion Heat source: heat from the core and radioactive decay CONVECTION

  22. Continental drift evidence • Seafloor spreading evidence • Earthquakes and volcano activity – concentrated zones plate boundaries • Measure plate motion through GPS • Hot spots – show plate movement Evidence for plate tectonics

  23. Hot Spot Formation of Hawaii

  24. DEFINE HOT SPOTS HOT SPOTS

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