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Ch 17 Review

Ch 17 Review

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Ch 17 Review

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  1. Ch 17 Review

  2. What 5 similarities on either side of the Atlantic Ocean provided evidence for continental drift? • Coastal Shapes • Rock Formations • Fossils • Ancient Climates • Glaciation

  3. If coal is found in a place that is now a cold, dry wasteland… what does that suggest? • The climate of the area had changed… it was once more temperate and rainy

  4. The newest part of the ocean floor is found near what? • Mid-ocean ridges

  5. What happens to plates at a transform boundary? • They slide past one another

  6. What transfers thermal energy within the mantle? • Convection currents

  7. The downward part of the convection current pulls plates… • Towards one another

  8. Early Observations • As early as the 1500s, mapmakers noticed what about the continents? • Matching coastlines

  9. Why was the continental drift hypothesis not widely accepted at first? • The movement of the continents

  10. Compared to oceanic crust near deep sea trenches, the age of the crust near the mid-ocean ridges is? • younger

  11. Compared to the crust near the mid-ocean ridges, the sediment deposits on the crust near the deep sea trenches? • Is thicker

  12. The magnetic pattern on oceanic crust near a mid-ocean ridge is • Symmetrically striped

  13. Each cycle of spreading and intrusion of magma at ocean ridges results in what? • Formation of new crust

  14. Rift valleys are found at what type of plate boundary? • divergent

  15. What process results in the formation of a deep sea trench? • subduction

  16. Continental-continental collisions produce what? • Very tall mountain ranges

  17. Oceanic-continental collisions produce what? • Volcanic mountain ranges

  18. Oceanic-oceanic collisions produce what? • Island arcs

  19. Crust is neither destroyed nor formed at which type of plate boundary? • transform

  20. Convection currents that drive the movement of tectonic plates are located where? • The mantle

  21. Wegener’s hypothesis that the world’s landmasses were once joined was called what? • Continental drift

  22. The study of the earth’s magnetic record is known as what? • Paleomagnetism

  23. A map line connecting points that have the same age are called what? • isochrons

  24. Plate boundary where plates slide past each other… • transform

  25. Plate boundary where plates move apart • Divergent boundary

  26. Process whereby the weight of an uplifted ocean ridge pushes an oceanic plate towards a subduction zone. • Ridge push

  27. Process whereby the weight of a subducting plate pulls the underlying lithosphere into the deep-sea trench. • Slab pull

  28. Process where one plate descends beneath another? • Subduction • Not SEDUCTION--- those would be naughty plates =)

  29. Type of boundary where 2 plates come together • convergent

  30. A change in the earth’s magnetic field is called a what? • Magnetic reversal

  31. A landmass thought to have been comprised of all present-day continents was called what? • pangaea

  32. A device that measures changes in earth’s magnetic field. • magnetometer

  33. A device that uses sound to map the ocean floor • sonar

  34. Deepest place on earth • Marianas trench

  35. Theory that states that earth’s crust is broken into enormous slabs • Plate tectonics

  36. the mechanism associated with plate movements • convection

  37. Deep scratches found on rocks is evidence of what? • glaciers.

  38. Where is the trench located? • D

  39. Where is the ocean ridge located? • E

  40. Where is subduction occurring? • D

  41. Where is the newest rock located near? • E

  42. Where is slab pull occurring? • C

  43. Where is ridge push occurring? • B

  44. Where is the convection current? • A