Continental Drift and Seafloor Spreading

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Author:
Jenbunni
ID:
73377
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Continental Drift and Seafloor Spreading
Updated:
2011-03-16 21:53:13
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Continental Drift Seafloor Spreading munasinghe
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Continental Drift and Seafloor Spreading
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  1. The _____ of the world continents suggest that there once was a super-continent that broke and drifted apart?
    Fit
  2. To see if two continents were together but drifted apart the first thing to check is their _____?
    Coastlines
  3. When continents were fitted the following features matched: _____, _____, and _____?
    Fossil Sites, Rocks, Climate Zones
  4. Continents are actually large blocks of _____ that _____ on the Asthenosphere?
    Rocks, Float
  5. The seafloor spread from the _____?
    MOR (rift valley)
  6. The oceanic lithosphere forms at the _____ from the magma that rises from the _____?
    MOR, Asthenosphere
  7. Oceanic lithosphere and the continental lithosphere both are moved by the moving _____?
    Asthenosphere
  8. _____ _____, a feature on the MOR clearly proves that the seafloor spreads from the MOR?
    Rift Valley
  9. As the distance from the MOR increases the age of the seafloor rocks _____?
    increases
  10. The discovery of seamounts covered with coral reefs away from the _____ shows that the seafoor moves?
    equator
  11. The Earth's magnetic field has _____ many times during the past?
    reversed
  12. Magnetic Anomaly = _____ magnetic field - _____ magnetic field?
    measured, theoretical
  13. Magnetic anomalies are formed at the MOR due to magnetic _____?
    reversals
  14. Magnetic anomalies are _____ about the MOR is proving seafloor is spreading from the MOR?
    symmetric
  15. Rocks that cause negative magnetic anomalies formed when the Earth's magnetic north pole was near the _____ pole?
    south
  16. As the distance from MOR increases, the sediment thickness _____.
    increases
  17. Marine magnetic anomalies can be used to determine the _____ and the _____ of plate notion?
    speed, direction
  18. Continents move because they _____ on the moving _____?
    float, asthenosphere
  19. About 180 million years ago India was near ___ and South America _____.
    Antarctica, Africa
  20. The _____ ocean opened as a result of the drifting of Africa and South America apart?
    Atlantic

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