Multiple Choice Questions

What is a seamount?
  • A seamount that grew above sea level, experienced wave erosion, and is now inactive.
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • An active volcano that occurs along the crest of the mid-ocean ridge.
  • volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks
Which is the correct order of coral reef development near seamounts?
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • a right lateral sense of motion
  • crustal upwarp, rift valley, linear sea, ocean
  • Fringing reef, barrier reef, atoll
Which of the following is a true statement regarding the Farallon Plate?
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • It was an oceanic plate that used to exist between the Pacific and North American Plates.
Which of the following is true regarding shallow subduction angles?
  • Seismic signals produced from an explosion travel to the ocean floor, penetrate some layers, and reflect back to a receiver.
  • It was an oceanic plate that used to exist between the Pacific and North American Plates.
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
Name the correct order of rifting events.
  • a right lateral sense of motion
  • The shelf represents the flooded portions of continents.
  • Fringing reef, barrier reef, atoll
  • crustal upwarp, rift valley, linear sea, ocean
Choose the true statement regarding the continental shelf.
  • the west coast of South America
  • The shelf represents the flooded portions of continents.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • The Atlantic is a passive margin, and the Pacific is an active margin.
Which response best explains the absence of volcanoes and earthquakes at a passive continental margin?
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Earthquakes and volcanoes are rare due to the distance from any active boundaries.
Moving off the east coast of North America, identify the sequence of environments you would encounter as you move deeper into the Atlantic Ocean.
  • continental shelf, continental slope, continental rise, abyssal plain
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
If the subduction angle is steep, the overriding plate may undergo __________.
  • subduction erosion
  • continental slope
  • seamount chains
  • a deep sea fan
What sequence of rocks would you expect rift valley evolution to produce, from oldest to youngest?
  • Earthquakes and volcanoes are rare due to the distance from any active boundaries.
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks
Satellites record slight variations on the sea surface using radar. What do these slight variations represent?
  • seamount chains
  • features on the seafloor
  • convergent; transform
  • seismic reflection survey
Where do coral reefs exist with sea mounts?
  • the west coast of South America
  • In tropical latitudes
  • a deep sea fan
  • continental slope
The timing of __________ and continental breakup strongly correlate.
  • The San Andreas and Queen Charlotte Faults were established where it was subducted beneath the North American plate.
  • flood basalt formation
  • a right lateral sense of motion
  • Fringing reef, barrier reef, atoll
Which feature would you expect to find at the mouth of a submarine canyon?
  • linear sea
  • seamount chains
  • continental slope
  • a deep sea fan
What feature connects the South American Paraná and African Entedeka flood basalts?
  • seismic reflection survey
  • a deep sea fan
  • subduction erosion
  • seamount chains
How are oceanic ridges different from mountainous regions on the continents? Choose all that apply.
  • Ocean depth is calculated by the time it takes sound waves to travel from the ship to the seafloor and back to the ship again.
  • volcanic rocks, clastic sedimentary rocks, deep sea sedimentary rocks
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • Ocean ridges form from upwelling mantle rock at divergent boundaries.
What is a tablemount?
  • A seamount that grew above sea level, experienced wave erosion, and is now inactive.
  • It was an oceanic plate that used to exist between the Pacific and North American Plates.
  • Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight.
  • Ocean depth is calculated by the time it takes sound waves to travel from the ship to the seafloor and back to the ship again.
Name all of the ocean bottom features shown in the image of the Los Angeles coast produced by the multibeam sonar.
  • shelf, canyons, slope, rise
  • convergent; transform
  • seismic reflection survey
  • features on the seafloor
Why do coral reefs at the ocean surface grow away from seamounts over time?
  • Ocean depth is calculated by the time it takes sound waves to travel from the ship to the seafloor and back to the ship again.
  • They represent volcanoes situated over mantle plumes that have since moved away from their source of magma and subsided.
  • Seismic signals produced from an explosion travel to the ocean floor, penetrate some layers, and reflect back to a receiver.
  • Seamounts subside as tectonic plates move. Coral reefs grow away from the seamount in order to stay near the sunlight.
Which of the following correctly describes the Atlantic and Pacific continental margins?
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • It was an oceanic plate that used to exist between the Pacific and North American Plates.
Which of the following describes a seismic reflection survey?
  • The Atlantic is a passive margin, and the Pacific is an active margin.
  • Barrier reefs surround an inactive volcano emerging above sea level, while atolls surround the previous location of a submerged volcano.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • Seismic signals produced from an explosion travel to the ocean floor, penetrate some layers, and reflect back to a receiver.
What is the difference between a barrier reef and an atoll?
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • They represent volcanoes situated over mantle plumes that have since moved away from their source of magma and subsided.
  • Barrier reefs surround an inactive volcano emerging above sea level, while atolls surround the previous location of a submerged volcano.
  • Seismic signals produced from an explosion travel to the ocean floor, penetrate some layers, and reflect back to a receiver.
The Gulf of Aden represents which part of the rifting sequence?
  • linear sea
  • canyons
  • a deep sea fan
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
Which statement best explains the formation of seamounts?
  • Seismic signals produced from an explosion travel to the ocean floor, penetrate some layers, and reflect back to a receiver.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • Barrier reefs surround an inactive volcano emerging above sea level, while atolls surround the previous location of a submerged volcano.
  • They represent volcanoes situated over mantle plumes that have since moved away from their source of magma and subsided.
Which is not one of the three broad zones describing the ocean floor?
  • continental slope
  • linear sea
  • In tropical latitudes
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
Which of the following statements about coral reefs and seamounts is most accurate?
  • Coral reefs at the ocean surface grow away from seamounts over time.
  • It was an oceanic plate that used to exist between the Pacific and North American Plates.
  • Sediment and seamounts are scraped from the downgoing plate to produce an accretionary wedge.
  • The Atlantic is a passive margin, and the Pacific is an active margin.
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Multiple Choice Questions
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