Ocean Geography and Ecology Quiz
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Questions and Answers

What is the maximum percentage of total oceanic Net Primary Productivity (NPP) attributed to the continental shelf?

  • 20% (correct)
  • 40%
  • 30%
  • 10%
  • What characterizes the continental slope?

  • It leads directly to the continental shelf.
  • It contains features like submarine canyons and gullies. (correct)
  • It gradually slopes at less than 2m per km.
  • It is typically 16km wide.
  • How does the presence of waves and river mouths affect the continental shelf?

  • It decreases nutrient levels.
  • It creates greater turbidity. (correct)
  • It increases light penetration.
  • It raises salinity in the water.
  • What is the primary feature that marks the transition from the continental slope to the deepest part of the ocean?

    <p>Continental rise</p> Signup and view all the answers

    What is mainly transported by rivers and contributes to the nutrient levels on the continental shelf?

    <p>Dissolved nutrients</p> Signup and view all the answers

    What geological process primarily leads to the formation of mid-ocean ridges?

    <p>Divergent plate boundaries</p> Signup and view all the answers

    How do the characteristics of fast spreading ridges differ from slow spreading ridges?

    <p>Slow spreading ridges present sharp and abrupt features</p> Signup and view all the answers

    What is the significance of hydrothermal vents in mid-ocean ridge ecosystems?

    <p>They support ecosystems independent of organic matter from the surface</p> Signup and view all the answers

    What type of lava is primarily associated with eruptions at mid-ocean ridges?

    <p>Pillow lava</p> Signup and view all the answers

    Which organisms rely on chemical energy from hydrothermal vents for their survival?

    <p>Tube worms and blind shrimp</p> Signup and view all the answers

    What geological process is primarily responsible for the formation of ocean trenches?

    <p>Subduction of tectonic plates</p> Signup and view all the answers

    What characteristic of ocean trenches distinguishes them from other ocean features?

    <p>They are symmetrical and have steep sides.</p> Signup and view all the answers

    Which adaptation helps organisms to survive in the extreme conditions of ocean trenches?

    <p>Bioluminescence for producing light</p> Signup and view all the answers

    What are guyots?

    <p>Flat-topped mountain peaks that once rose above sea level</p> Signup and view all the answers

    What is the primary difference between the depths and sediments of the Atlantic and Pacific oceans?

    <p>The Pacific has more ocean trenches trapping incoming sediment.</p> Signup and view all the answers

    Which process allows certain bacteria in ocean trenches to produce organic nutrients?

    <p>Chemosynthesis</p> Signup and view all the answers

    What is the approximate depth of the Challenger Deep in the Mariana Trench?

    <p>11,000 meters</p> Signup and view all the answers

    The abyssal plains make up what fraction of the Earth's surface?

    <p>One-half</p> Signup and view all the answers

    What type of rock is predominantly found on the oceanic side of a trench?

    <p>Sedimentary</p> Signup and view all the answers

    What geological feature marks the center of slowly spreading ridges on the ocean floor?

    <p>Rift valleys</p> Signup and view all the answers

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