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Metamorphic Rocks

45 Questions
Metamorphic Rocks

Assessment on metamorphic rock characteristics and identification.

Questions and Answers
  • 1. 
    One plate tectonic process that causes very widespread metamorphism is ____________________.
  • 2. 
    The most important fluid promoting metamorphism is ____________________.
  • 3. 
    The three types of metamorphism are ____________________, ____________________, and ____________________.
  • 4. 
    Metamorphic rocks are commonly divided into these two groups, based on their textures: ____________________ and ____________________.
  • 5. 
    The type of metamorphism that typically produces the hard, dense, fine-grained rocks called mylonites is called ____________________.
  • 6. 
    The type of metamorphism that occurs over large areas, commonly at convergent plate margins, and is responsible for the production of most metamorphic rocks is ____________________.
  • 7. 
    Metamorphism is most common along ____________________ plate boundaries.
  • 8. 
    As the plate subducts until it begins to melt, it generates magma, which rises and causes ____________________ metamorphism.
  • 9. 
    If metamorphic rock contains biotite, garnet, and staurolite, it is ____________________ grade.
  • 10. 
    Many ore deposits, including tin and tungsten, are associated with ____________________metamorphism.
  • 11. 
    Rocks that have been changed from previously existing rocks (but that were not completely melted) by the action of heat, pressure, and associated chemical activity are:_____ rocks
    • A. 

      Intrusive

    • B. 

      Igneous

    • C. 

      Metamorphic

    • D. 

      Sedimentary

  • 12. 
    Metamorphic rocks are those that:
    • A. 

      Are claimed to have certain metaphysical properties, e.g., quartz crystals.

    • B. 

      Have different mineral compositions due to increased temperature and pressure.

    • C. 

      Have different chemical compositions due to organisms and sediments

    • D. 

      Have the same chemical compositions of igneous rocks

  • 13. 
    Metamorphic rocks may form from _______ rocks.
    • A. 

      Igneous

    • B. 

      Sedimentary

    • C. 

      Metamorphic

    • D. 

      All answers apply

  • 14. 
    Which three processes bring about metamorphism?
    • A. 

      Heat, pressure, weathering

    • B. 

      pressure, fluid activity, heat

    • C. 

      Melting, pressure, fluid activity

    • D. 

      Crystallization, differential pressure, melting

  • 15. 
    The two most important sources of heat for metamorphism are
    • A. 

      Intrusive magma bodies and deep burial

    • B. 

      deep burial and volcanism

    • C. 

      Radioactive decay and volcanism

    • D. 

      Radioactive decay and deep burial

  • 16. 
    Contact metamorphism is found along the boundaries between country rock and
    • A. 

      Dikes

    • B. 

      Batholiths

    • C. 

      Sills

    • D. 

      All answers apply

  • 17. 
    Which of the following lists of foliated rock types is arranged according to increasing coarseness of texture?
    • A. 

      slate, phyllite, gneiss, schist

    • B. 

      Slate, amphibolite, schist, phyllite

    • C. 

      Schist, phyllite, gneiss, slate

    • D. 

      Slate, phyllite, schist, gneiss

  • 18. 
    The type of metamorphism that is common in fault zones, in which rocks are subjected to high differential pressures, is called
    • A. 

      Contact

    • B. 

      Regional

    • C. 

      Dynamic

    • D. 

      Differential

  • 19. 
    Metamorphic rocks are most common in the ocean basins.
    • A. 

      True

    • B. 

      False

  • 20. 
    Metamorphic rocks are the oldest known rocks.
    • A. 

      True

    • B. 

      False

  • 21. 
    Metamorphic rocks are very common in the crystalline basement rocks of the oldest parts of continents.
    • A. 

      True

    • B. 

      False

  • 22. 
    The concentric zones surrounding an igneous intrusion, and in which contact metamorphism has taken place, are called aureoles.
    • A. 

      True

    • B. 

      False

  • 23. 
    Metamorphic rocks indicate that an even older parent rock once existed in that place.
    • A. 

      True

    • B. 

      False

  • 24. 
    Metamorphic rocks can indicate the physical conditions that once existed in a geological setting.
    • A. 

      True

    • B. 

      False

  • 25. 
    Metamorphic rocks can indicate the chemical changes that have occurred at various depths.
    • A. 

      True

    • B. 

      False

  • 26. 
    Contact metamorphism along sills and dikes may produce metamorphosed zones many kilometers wide.
    • A. 

      True

    • B. 

      False

  • 27. 
    Contact metamorphism can take place beside a lava flow.
    • A. 

      True

    • B. 

      False

  • 28. 
    The temperature of the intrusive magma has little effect on the metamorphic minerals formed.
    • A. 

      True

    • B. 

      False

  • 29. 
    The index minerals that form in a metamorphic rock depend on the composition of the parent rock affected.
    • A. 

      True

    • B. 

      False

  • 30. 
    Differential pressure results from unequal pressure on different sides of a rock
    • A. 

      True

    • B. 

      False

  • 31. 
    A rock that has undergone medium to high grade metamorphic conditions and was originally quartz sandstone is slate.
    • A. 

      True

    • B. 

      False

  • 32. 
    The mineral calcite makes up the rock limestone; metamorphosed limestone is marble.
    • A. 

      True

    • B. 

      False

  • 33. 
    The classification scheme your textbook presents for metamorphic rocks depends first on color and then on composition.
    • A. 

      True

    • B. 

      False

  • 34. 
    Economically valuable minerals often found in metamorphic rocks include talc.
    • A. 

      True

    • B. 

      False

  • 35. 
    Marble's parent rock is quartz.
    • A. 

      True

    • B. 

      False

  • 36. 
    This metamorphic rock is foliated, crystallin and course grained from a  regional metamorphic area.  The name of this rock is_____________.
  • 37. 
    This rock's mineral composition is aluminous.  It is nonfoliated with medium to fine grains due to contact metamorphism.  The name of this rock is____________. 
  • 38. 
    This rock was formed by contact metamorphism, nonfoliated and is high grade.  It often used in homes as flooring. The name of this rock is____________. 
  • 39. 
    This rock is foliated has no particular grain orientation and is platy or pancake shaped.  It is produced through regional metamorphism.   The name of this rock is____________.   
  • 40. 
    This rock is nonfoliated, crystallin and fine to medium grained.  The minerals present in it are quartzofeldspathic.  It was produced by contact metamorphism.  The name of this rock is____________. 
  • 41. 
    This rock has aluminous minerals, is foliated and produce via regional metamorphism.  The name of this rock is____________.
  • 42. 
    This rock is mafic and has a course texture and produced through regional metamorphism.  It's green color is significant to its mafic nature.  The name of this rock is____________. 
  • 43. 
    This rock has calcereous minerals, is nonfoliated, crystalline and can have fine or large grains of rubies or emeralds.  It is produced throught contact metamorphism.  The name of this rock is____________.
  • 44. 
    This rock is aluminous, foliated and platy or pancake in shape.  It is produced through regional metamorphism and has a low grade.  This rock is also used in home as flooring. The name of this rock is____________.
  • 45. 
    This rock is calcareous, non foliated and fine grained.  It is produced through dynamic metamorphism and has a slippery feel to it. The name of this rock is____________.
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