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Currents and Tides

Multiple Choice
 

 1. 

Which of these causes ocean waves?
a.
the wind
c.
the moon's gravity
b.
density differences
d.
the Sun’s Gravity
 

 2. 

What is the main cause of ocean tides?
a.
change in water temperature
c.
gravitational pull of the moon
b.
energy from the sun
d.
rotation of the earth
 

 3. 

How many high tides happen to the same spot each day?
a.
two
c.
four
b.
one
 

 4. 

What is a tide?
a.
the amount of water that seeps into the sand
c.
the daily rise and fall of ocean water levels
b.
the point at which waves break on shore
 

 5. 

If the Sun is bigger than the Moon, why does the Moon have a greater effect on the tides?
a.
the Moon is actually almost as big as the Sun
c.
the Moon is much closer than the Sun
b.
the Sun’s gravity does not affect water
 

 6. 

When the Sun, Moon, and Earth form a 90° angle, we have ____ tides.
a.
spring
c.
fall
b.
normal
d.
neap
 

 7. 

Which term refers to the area at the seashore that is underwater during high tide and exposed during low tide?
a.
neritic zone
c.
intertidal zone
b.
mid-ocean zone
d.
open-ocean zone
 

 8. 

What is the main force that drives surface currents?
a.
the Moon
c.
geothermal energy
b.
the wind
 

 9. 

Which of these statements about currents is true?
a.
all currents are caused by the wind
b.
some currents are caused by a difference in either density or temperature and others are caused by the wind
c.
all currents are caused by the sun
d.
all currents move in the same direction
 

 10. 

When the Moon, Earth, and Sun are in line,  the differences in the tides or the tidal range is ____.
a.
lowest
c.
greatest
b.
unchanged
d.
unpredictable
 

 11. 

Surface currents are pushed along by the prevailing winds.  What can make them change directions?
a.
the waves
c.
continental deflection
b.
gyres
d.
the tides
 

 12. 

The Gulf Stream delivers warm water to what region?
a.
Hawaii
c.
the East Coast of North America
b.
Western Europe
 

 13. 

What type of currents will flow along the ocean floor?
a.
surface currents
c.
gyres
b.
density currents
d.
prevailing winds
 

 14. 

What causes the Corriolis effect?
a.
the Earth’s rotation
c.
the wind
b.
the global conveyor belt
 

 15. 

Surface currents can affect ____.
a.
low tides
c.
the ocean bottom
b.
the climate on continents
d.
high tides
 

 16. 

Which of these are true about the tides?
a.
there is one high tide and one low tide every 24 hours
b.
they can happen at any time and are unpredictable
c.
they are caused by the Moon and change every 6 hours
d.
they are caused by the wind
 

 17. 

If you were floating in a raft in the Gulf Stream, you and the raft would ____.
a.
move back and forth
c.
move with the current
b.
move in a circular motion
d.
not move with the water
 

 18. 

Which of these pictures will cause a Spring tide?
a.
mc018-1.jpg
c.
mc018-3.jpg
b.
mc018-2.jpg
 

 19. 

What is the ebb tide?
a.
the incoming water at high tide
c.
the water that comes from a breaker
b.
the out going water at low tide
d.
the water flow caused by a tsunami
 

 20. 

Which of these pictures will cause a neap tide?
a.
mc020-1.jpg
c.
mc020-3.jpg
b.
mc020-2.jpg
 



 
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