Science Ch. 5

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Author:
jb124
ID:
231656
Filename:
Science Ch. 5
Updated:
2013-08-27 23:18:00
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plate tectonics
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plate tectonics
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  1. The youngest rocks on the ocean floor are located ___
    mid-ocean ridge
  2. The crust and upper mantle make up Earth's ___
    lithosphere
  3. Scientists have observed that the plates move at rates ranging from 1 cm to 12 cm per ___
    year
  4. Plates of the lithosphere float on the ___
    asthenosphere
  5. The result of plate movement can be seen at ___
    plate boundaries
  6. The ___ are mountains formed by the collision of the Indo-Austrailian Plate and the Eurasian Plate.
    Himalaya
  7. The presence of the same ___ on several continents supports the hypothesis of continental drift.
    fossils and rocks
  8. The hypothesis that continents have slowly moved to their current locations is called ___
    continent drift
  9. Plates move apart at ___ boundaries
    divergent
  10. The alignment of iron minerals in rocks when they are formed reflects the fact that Earth's ___ has reversed itself several times in the past.
    magnetic field
  11. A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ___ once existed
    Pangaea
  12. The Glomar Challenger provided support for the theory of plate tectonics by providing ___
    samples of older rock
  13. Plates slide past one another at ___
    transform boundaries
  14. The boundary between two plates moving together is called a ___
    convergent boundary
  15. Seafloor spreading occurs because ___
    molten material beneath Earth's crust rises to the surface
  16. While studying the ocean floor, scientists found ___ bands of magnetism
    alternating
  17. Continental drift states that continents have moved ___ to their current location
    slowly
  18. Wegener believed that the continents originally broke apart about ___ years ago
    200 million
  19. A fossil plant that helps support the theory of continental drift is ___
    glossopteris
  20. Matching ___ on different continents are evidence for continental drift
    rock structures
  21. Bands of rock on the seafloor showing alternating magnetic orientation indicate Earth's magnetic field has ___
    reversed itself in the past
  22. A ___ is a sensitive device used to detect magnetic fields on the seafloor
    magnetometer
  23. ___ currents inside Earth might drive plate motion
    Convection
  24. Scientists believe that differences in ___ cause hot, plasticlike rock in the astenosphere to rise toward Earth's surface
    density
  25. In order to complete a convection current, the rising material must eventually ___ Earth
    sink back into
  26. The Great Rift Valley in Africa is a ___
    divergent boundary
  27. The Andes mountain range of South America was formed at a ___
    convergent boundary
  28. Active volcanoes are most likely to form at ___
    convergent oceanic-continental boundary
  29. ___ are formed when two continental plates collide
    Mountain ranges
  30. The ___ is (are) an example of a transform boundary
    San Andreas Fault
  31. A ___ forms where two oceanic plates collide
    subduction zone
  32. The seafloor spreading theory was proposed by ___
    Harry Hess
  33. As Earth's plates collide, ___ form at the plate boundaries
    mountains and volcanoes
  34. The cycle of heating, rising, cooling, and sinking is called a ___
    convection current
  35. Ocean floor rocks are ___ continental rocks
    younger than

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