26.The Mariana Trench is locatedat what type of plate boundary? a.Convergent b.D
ID: 288945 • Letter: 2
Question
26.The Mariana Trench is locatedat what type of plate boundary?
a.Convergent
b.Divergent
c.Transform
d.All boundary types
27.The east coast of the United States isknown as an:
a.Active margin
b.Passive margin
c.Earthquake margin
d.Tectonic margin
28.The region just off the east coast of Japan is known as an:
a.Active margin
b.Passive margin
c.Earthquake margin
d.Tectonic margin
29.Ocean trenches:
a.Are caused by divergence at divergent margins.
b.Parallel continents and island arc volcanoes.
c.Are created at transform boundaries during earthquakes.
d.Are typically only ~10 meters deep.
30.The seafloor does not get any older than ~200 million years olddue to:
a.Volcanism incinerating existing sedimentat mid-ocean ridges.
b.The CCD dissolving all sediment before it candeposit.
c.Subduction at the edges of ocean basins.
d.Pressure at great depths dissolves all sedimenton ocean floor over time.
31.The portion of the continental margin that marks the true edge of the continent is:
a.Continental shelf
b.Continental slope
c.Continental rise
d.Abyssal plain
32.Submarine canyons are believed to be shaped primarily by:
a.Transform faults
b.Rifting
c.Turbidity currents
d.Converging ocean plates
33.Sediments found on continental margins are called:
a.Continental
b.Neritic
c.Oceanic
d.Pelagic
34.A wedge of sediment that sits up against the continental slope is called?
a.The continental shelf
b.The continental slope
c.The continental rise
d.The continental current
35.Pelagic sediments are primarily found in the:
a.Continental shelf
b.Continental slope
c.Continental rise
d.Abyssal plain
36.Manganese nodules are important in the production of __________.
a.Sand
b.Phosphates
c.Iron
d.Steel
37.What is true about oozes from the statements below:
a.Siliceous oozes are softer than Calcareous oozes.
b.Calcareous oozes are softer than Siliceous oozes.
c.Calcareous and Siliceous oozes are about the same hardness.
38.Calcium carbonate will dissolveat an equal rate to its supply at the CCD. What happens below the CCD?
a.Calcium carbonate will still dissolve at an equal rate to its supply.
b.Calcium carbonate will dissolve at faster rate to its supply.
c.Calcium carbonate will dissolve at a slower rate to its supply.
39.In relation to the deposition of pelagic sediments, what happens below the CCD on the sea floor?
a.Calcareous ooze will deposit below the CCD and Siliceous ooze will dissolve.
b.Calcareous ooze will dissolve below the CCD and Siliceous ooze will deposit.
c.All oozes, whether Calcareous or Siliceous, will deposit.
d.Both Calcareous andSiliceous oozes will dissolve below the CCD.
Explanation / Answer
26. A: Trench is a convergent margin feature.
27. B: East coast of U.S. has no seismicity.
28. C: 90% of the earthquake are related to this area. (ring of fire)
29. B: Island arc in ocean and continents are parallel in oceanic subduction.
30. C: Subduction consumes the oceanic plates.
31. A: Shelf is a transition from continental part to oceanic part.
32. C: Turbidity Currents guid the Submarine canyons.
33. B: Neritic Sediments.
34. C: The continental rise.
35. D: Pelagic sediments are found very far away from the continental margin and deep into the ocean.
36. C: manganese nodules contain iron, manganese and other metals.
37. B: Siliceous ooze may contain quartz and therefore harder that calcareous ooze.
38. B: Calcium carbonate dissolves at faster rate to its supply.
39. B: Because below CCD calcium carbonate dissolves and siliceous ooze deposits.
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