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Ocean Currents

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FL 6th Grade Unit 3 Lesson 5

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Questions 6

Answers

1
How would ocean surface currents most likely differ if Earth did not have continents?
Surface currents would form straight lines instead of gyres.
Surface currents would be regularly shaped gyres.
The direction of surface currents would reverse.
Surface currents all over Earth would rotate clockwise.
2
What three factors most directly affect surface currents in the oceans?
dissolved solids, dissolved gases, energy
upwelling, convection, and the sun’s energy
surface winds, Coriolis effect, and continental deflection
deep currents, convection currents, and surface winds
3
Which of these movements of ocean water has the greatest effect on the growth of producers?
convection current
deep current
surface current
upwelling
4
How does convection cause ocean currents?
heating of surface water by the sun causing upwelling.
warm water dissolves more minerals and gases making it sink
cooler water at poles sinks, warmer water at equator rises
energy is transferred to surface winds
5
Which of the following best describes the movement of heat energy in the global ocean?
Heat in warm surface currents is transported to the poles.
Heat is transported from low temperature to high temperature
Heat is transported to the equator from the continents
Heat in deep currents is transported to the ocean’s surface
6
When upwelling takes place, which of the following happens?
The number of phytoplankton near the surface increases.
The number of bacteria on the ocean floor increases.
The number of coastal birds increases.
The number of fish near the bottom increases.