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BrainPop waves etc

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

 1. 

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

 2. 

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

 3. 

How deep do surface currents extend?
a.
all the way to the ocean floor
c.
one hundred to two hundred meters
b.
one or two kilometers
 

 4. 

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

 5. 

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

 6. 

What is a gyre?
a.
a kind of wind that blows all the time
c.
a large circular surface current
b.
a slow-moving current several kilometers deep
 

 7. 

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

 8. 

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
 

 9. 

What causes the tides?
a.
the pull of gravity between the Earth, Moon, and the Sun
c.
coriolis effect
b.
wind
 

 10. 

What do you call the distance between two wave crests?
a.
amplitude
c.
frequency
b.
wavelength
 



 
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