Ocean Currents (Grade 9)
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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.
Surface and near-surface ocean currents are powered primarily by wind.
Deep ocean currents typically move water in a north-south direction.
Water on the ocean's surface always moves in a clockwise pattern.
Water moving parallel to the shore is called:
- tidal current
- beach drift
- rip current
- longshore current
Which percentage best estimates the velocity of a wind driven current compared to the velocity of the wind controlling the current?
- [math]20 - 40%[/math]
- [math]60 - 80%[/math]
The two major controlling factors for deep ocean currents are
- salinity and wind
- pressure and salinity
- wind and temperature
- temperature and salinity
The northern hemisphere surface currents flow in a direction and the southern hemisphere surface currents flow in a direction.
- clockwise, clockwise
- clockwise, counterclockwise
- counterclockwise, clockwise
- counterclockwise, counterclockwise
The causes ocean currents to be deflected from their path.
- surface currents
- Coriolis effect
- 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.