Practice Quiz

NAEP Science Grade 12 - Question List

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81.
Submerged flat-topped seamounts called guyots are found in a variety of locations in the world's oceans. These guyots are typically formed through which of the following processes?
  1. The growth of coral reefs.
  2. The accumulation of marine diatoms.
  3. The erosion of volcanic islands.
  4. The uplift of tectonic plate fragments.
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82.
Scientists believe that submarine canyons that formed well below sea level and cut to the bottom of the continental rise most likely were produced when:
  1. Fine-grained marine sediments of the continental shelf were fractured by the weight of the overlying water.
  2. Geologic faults lying perpendicular to the continental shelf ruptured, offsetting overlying sediments.
  3. Turbidity currents scoured channels in the unconsolidated sediments of the continental shelf.
  4. Dense freshwater from coastal rivers flowed down over the continental shelf, eroding soft marine muds.
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83.
The Atlantic Ocean began to form as a result of which of the following geologic events?
  1. The erosion of a plate margin from repeated continental glaciations.
  2. The subduction of one continental plate beneath another.
  3. The development of a large syncline east of the Appalachian Mountains.
  4. The growth of a rift valley along a major fracture zone in the crust.
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84.
Which of the following geologic structures is characteristic of a passive continental margin?
  1. A thick sedimentary platform.
  2. An inundated forearc basin.
  3. A complex accretionary wedge.
  4. An active fault zone.
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85.
Which of the following organisms is most responsible for fixing atmospheric carbon dioxide to create organic molecules?
  1. Coral polyps
  2. Bacteria
  3. Phytoplankton
  4. Protozoa
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