Exercise
Form 6: Ocean Trenches and Subduction Zones
Explore ocean trenches and the processes occurring at subduction zones. Learn how old tectonic crust descends back into Earth's mantle.
Questions
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MultiChoice
What process sinks old, dense oceanic crust back into Earth's mantle?
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MultiChoice
At what ocean floor feature does subduction take place?
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MultiChoice
Why does oceanic crust subduct beneath continental crust during collisions?
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MultiChoice
What happens to oceanic crust after it sinks deep into the mantle?
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MultiChoice
Which ocean basin is slowly shrinking because it is surrounded by subduction zones?
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MultiChoice
Which ocean basin is expanding because it has mid-ocean ridges but very few subduction zones?
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MultiChoice
What chain of volcanic mountains forms on land above a subducting plate?
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MultiChoice
What curved chain of volcanic islands forms when one oceanic plate subducts under another oceanic plate?
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MultiChoice
What is the deepest single spot on Earth's ocean floor?
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MultiChoice
Why does older oceanic crust sink more easily into the mantle than younger crust?
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MultiChoice
What seismic event regularly occurs along subduction zone boundaries?
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MultiChoice
What is the region where one plate slides beneath another called?