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Ocean Currents (Grade 9)

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Ocean Currents

The Gulf Stream is a cold, low-salinity ocean current that flows north-westward along the west coast of South America from the southern tip of Chile to northern Peru.
  1. True
  2. False
Surface and near-surface ocean currents are powered primarily by wind.
  1. True
  2. False
Deep ocean currents typically move water in a north-south direction.
  1. True
  2. False
Water on the ocean's surface always moves in a clockwise pattern.
  1. True
  2. False
Water moving parallel to the shore is called
  1. tidal current.
  2. beach drift.
  3. rip current.
  4. longshore current.
Which percentage best estimates the velocity of a wind driven current compared to the velocity of the wind controlling the current?
  1. [math]<10%[/math]
  2. [math]20 - 40%[/math]
  3. [math]60 - 80%[/math]
  4. [math]>90%[/math]
The two major controlling factors for deep ocean currents are
  1. salinity and wind.
  2. pressure and salinity.
  3. wind and temperature.
  4. temperature and salinity.
The Northern Hemisphere surface currents flow in a                                    direction and the Southern Hemisphere surface currents flow in a                                    direction.
  1. clockwise, clockwise
  2. clockwise, counterclockwise
  3. counterclockwise, clockwise
  4. counterclockwise, counterclockwise
The                     causes ocean currents to be deflected from their path.
  1. surface currents
  2. tides
  3. Coriolis effect
  4. deep ocean currents
Compare and contrast ocean surface and subsurface currents. Include information about what powers the currents, total volume of water they encompass, and name at least one of each type of current.

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