Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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Late Paleozoic glacial deposits are not found in
which of the following places?
a. | India | b. | southern Africa | c. | North
America | d. | South America |
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2.
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All basalts younger than 700,000 years old
____________.
a. | have normal magnetic polarity | b. | have reverse magnetic polarity | c. | are found on the ocean floor very far from mid-ocean
ridges | d. | are found on the
continents |
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3.
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The theory of plate tectonics
____________.
a. | incorporates continental drift but not sea-floor
spreading | b. | incorporates sea-floor spreading but not continental
drift | c. | incorporates and explains both sea-floor spreading and
continental drift | d. | does not
incorporate sea-floor spreading or continental drift |
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4.
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Mid-ocean ridges are ____________.
a. | convergent plate boundaries | b. | divergent plate boundaries | c. | transform plate boundaries |
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5.
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The youngest sea floor occurs
____________.
a. | along passive margins | b. | along active margins | c. | along mid-ocean
ridges | d. | randomly over the entire ocean
basin |
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6.
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Summed over the entire surface of Earth,
____________.
a. | the rate of lithospheric production at ridges is greater
than the rate of lithospheric consumption at subduction zones | b. | the rate of lithospheric consumption at subduction zones is greater than the
rate of lithospheric production at ridges | c. | rates of
lithospheric production and consumption are equal |
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7.
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All rock produced at the mid-ocean ridges consists
of basalt.
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8.
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All portions of the mid-ocean ridge system have a
well-defined axial trough (central rift).
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9.
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The pulling forces that produce the most rapid
plate velocities are concentrated at ____________.
a. | mid-ocean ridges | b. | ocean trenches | c. | continental
collision zones | d. | stable continental
interiors |
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10.
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Change in shape, induced by stress, is termed
____________.
a. | plastic deformation | b. | pressure release | c. | strain | d. | metamorphosis |
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11.
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Movement along faults often produces sharply angled
rock fragments termed ____________.
a. | fault gouge | b. | rock flour | c. | fault
breccia | d. | slickensides |
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12.
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Orogenesis (mountain building) leads to the
production of ____________.
a. | metamorphic rocks only | b. | igneous rocks only | c. | sedimentary rocks
only | d. | all three major rock
types |
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13.
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On a geologic map, if the contacts between
sedimentary rock units form a series of parallel lines, with the youngest unit in the center, the
underlying structure is a(n) ____________.
a. | anticline | b. | basin | c. | dome | d. | syncline |
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