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Deep Currents Quiz

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 

A large stream of moving water that flows through the oceans is called a(n)
a.
current.
b.
wave.
c.
tide.
d.
undertow.
 

 2. 

Compare saltwater to freshwater.
a.
there is more freshwater
c.
saltwater is less dense
b.
saltwater is more dense
d.
freshwater is more dense
 

 3. 

Surface currents are moved by the wind.  What else can cause currents to move?
a.
the Moon
c.
density
b.
earthquakes
d.
plankton
 

 4. 

A current that is caused by the differences in hot and cold water or salty and fresh water is a
a.
surface current
c.
a density current
b.
a gyre
d.
the Gulf Stream
 

 5. 

What causes a deep current?
a.
high-speed winds
c.
greater density because of temperature and aalinity
b.
warm, freshwater
d.
less density which causes the water to rise.
 

 6. 

Along the equator, what can cause a density current?
a.
rapid evaporation
c.
the Trade Winds
b.
prevailing winds
d.
continental deflection
 

 7. 

When seawater freezes how does this cause a denssity current if ice floats?
a.
it makes the water less dense
c.
seawater cannot freeze
b.
as it freezes, it leaves behind the salt making the other water more salty
d.
only freshwater freezes
 

 8. 

Deep currents are caused mostly by
a.
surface winds.
b.
differences in density.
c.
the Coriolis effect.
d.
upwelling.
 

 9. 

What brings nutrients up from the ocean floor?
a.
continental deflection
c.
surface winds
b.
upwelling
 

 10. 

The deep current that circulates around the world and helps control the Earth’s climate.
a.
the Gulf Stream
c.
the North Atlantic Current
b.
the South Atlantic G yre
d.
the Thermohaline Circulation
 

 11. 

What causes the winds and the currents to curve?
a.
huge seamounts
c.
the coriolis effect
b.
the continents
d.
the Gulf Stream
 

 12. 

What is the main cause of the Gulf Stream?
a.
storms
c.
the prevailing winds
b.
winds that blow now and then
d.
the moon’s gravity
 

 13. 

How would the climate change in Europe if the Gulf Stream were to stop?
a.
it would not change
c.
it would be much colder
b.
it would be much warmer
d.
there is no way to know
 

 14. 

The Gulf Stream is what kind of current?
a.
a density current
c.
a surface current
b.
a fresh water ocean current
 

 15. 

These surface currents are wind driven and move in large circular patterns.
a.
density currents
c.
prevailing winds
b.
gyres
d.
upwellings
 



 
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