Oceanography: Ocean Basins and Features
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Questions and Answers

What primarily causes the formation of mid-ocean ridges?

  • Transform plate boundaries
  • Convergent plate boundaries
  • Plate fracture zones
  • Divergent plate boundaries (correct)

    • How do the topographies of fast and slow spreading ridges differ?

  • Slow spreading ridges have rift valleys, while fast spreading ridges are smoother and dome-like. (correct)
  • Fast spreading ridges have rift valleys, while slow spreading ridges have smoother surfaces.
  • Fast spreading ridges rise 100-200 meters, while slow spreading ridges are flatter.
  • Both types of ridges are characterized by continuous peaks.

    • What temperature can ocean water reach when it interacts with magma at hydrothermal vents?

  • 450°C
  • 100°C
  • 250°C
  • 380°C (correct)

    • Which organism is NOT commonly found in the unique ecosystems supported by hydrothermal vents?

    <p>Coral reefs</p> Signup and view all the answers

    What role do bacteria play in the ecosystems near hydrothermal vents?

    <p>They fix energy from vent chemicals.</p> Signup and view all the answers

    What geological feature is primarily associated with ocean trenches?

    <p>Subduction Zones</p> Signup and view all the answers

    Which type of rock is primarily found on the oceanic side of ocean trenches?

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

    What is the main source of energy for organisms in ocean trenches?

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

    What is the average width of the continental shelf?

    <p>70 km</p> Signup and view all the answers

    What depth is the Challenger Deep, the deepest point on Earth?

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

    What characterizes the continental slope in an ocean basin?

    <p>It has a steep incline dropping approximately 70 m per km.</p> Signup and view all the answers

    Which of the following features is part of the ocean basin relief?

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

    What are guyots characterized by?

    <p>Flat Tops</p> Signup and view all the answers

    What is the primary characteristic of the abyssal plain?

    <p>It is a vast, flat area of the ocean floor at great depths.</p> Signup and view all the answers

    What is marine snow?

    <p>Organic matter falling from higher parts of the ocean</p> Signup and view all the answers

    Which zone has the highest net primary productivity (NPP)?

    <p>Photic zone</p> Signup and view all the answers

    What is a primary characteristic of abyssal plains?

    <p>Mountain chains and isolated peaks</p> Signup and view all the answers

    How does salinity change near large river mouths?

    <p>It decreases due to the influx of freshwater.</p> Signup and view all the answers

    What phenomenon describes the movement observed at the Mid-Atlantic Ridge?

    <p>Seafloor Spreading</p> Signup and view all the answers

    What influences the continuity of the continental slope?

    <p>Presence of submarine canyons and gullies.</p> Signup and view all the answers

    What contributes to higher turbidity near river mouths?

    <p>High sediment from waterways.</p> Signup and view all the answers

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