Ocean Basins

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Ocean Basins
2011-02-16 23:15:06
Ocean Basins Munasinghe

Ocean Basins
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  1. About _____ % of the Earth surface is covered with water.
  2. The three methods used to measure Ocean Depth are _____, _____, and _____.
    • Rope & Weight
    • SONAR
    • Satellite Altimetry
  3. If a sound pulse took 6 seconds to return from the seafloor, and if the speed of sound is 1500 m/sec, the depth is _____.
    4500 M.

    • (1500 m/sec)(6 sec)
    • 2
  4. The 3 components of the Continental Margin are the _____, _____, and _____.
    Shelf, Slope, Rise
  5. The Continental _____ is the submerged part of the continent. Its width varies with changing _____.
    Margin, Sea levels.
  6. The true edge of the continent is marked by the continental _____.
  7. Most beach sediments eventually end up depositing at the continental _____, at the foot of the _____.
    Rise, Slope
  8. _____ form by the covering of the rocky seafloor with mud falling from seawater.
    Abyssal Plains
  9. _____ is the location where the seafloor forms and _____ are where they are destroyed.
    MOR (Mid-Oceanic Ridge), Trench
  10. The feature that clearly indicates that the seafloor spreads from the _____ is the _____ valley.
    MOR (Mid-Oceanic Ridge), Rift
  11. Fresh lava flows, and _____ along the _____ valleys indicates that the seafloor is spreading continuously.
    Earthquakes, Rift
  12. As seafloor moves away from the MOR, it _____ taking any seamounts _____ with it.
    Sinks, Down
  13. Seamounts are submarine _____. They form over _____, or _____.
    Volcanoes, Hotspots, Subduction Zones
  14. List the evolution of seamounts.
    • Seamount
    • Volcanic Island
    • Atoll
    • Guyot
  15. Ocean basins are generally _____than continents.
  16. Submarine canyons are deep _____ that cut acoss continental _____.
    Valleys, Margin
  17. Submarine canyons transport coastal _____ to the continental _____.
    Sediments, Rise
  18. The top of a guyot is _____ due to _____ by waves.
    Flat, erosion.
  19. Turbidity currents are submarine _____of mud and sand, and they transport sediments very _____.
    Avalanches, Far.
  20. If the global sea level increased the area of the continental shelves will _____.
  21. Submarine canyons form primarily due to mass movement along the continental _____.
  22. _____ are submerged seamounts with coral reefs on them. They commonly enclose a _____.
    Atolls, lagoon
  23. The Continental _____ is the submerged extension of the continents.
  24. Ocean = Seawater + _____
  25. The shape and size of ocean basins constantly _____ over geologic time.
  26. _____ are the deepest parts of oceans. They form due to _____ of the seafloor into the Mantle.
    Trenches, Subduction (Sinking)
  27. Ocean Basins _____ along Mid-Oceanic Ridges.
  28. Submarine canyons are _____ trenches.
  29. All trnches are actuall over 27,000 feet deep, but most of them are filled with _____ that come from nearby continents.
  30. MORs can be identified by the presence of the _____ at the top.
    Rift Valleys
  31. During the Ice Ages when the sea level was low, the continental shelves we _____.
  32. Most ocean trenches are found in the _____ Ocean.
  33. Oceans form by _____ moving apart.
  34. All oceans have a _____ in them.
    MOR (Mid-Oceanic Ridge)
  35. Due to Global Warming the width of the continental shelves is _____.