Name:     ID: 
 
Email: 

Currents, Waves, and Tides

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

 1. 

Wavelength is the distance between two wave ____.
a.
crests
c.
tides
b.
particles
d.
breakers
 

 2. 

The Gulf Stream and North Atlantic Current both affect Europe's climate. What type of current are they?
a.
warm deep currents
c.
cold surface currents
b.
warm surface currents
d.
cold deep currents
 

 3. 

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

 4. 

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

 5. 

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

 6. 

   The distance between a wave's crest and its trough is known as its  
a.
  wave height.  
c.
  wave length.  
b.
  water depth.  
d.
  low tide measurement.  
 

 7. 

Which letter on this wave is the crest?
mc007-1.jpg
a.
A
c.
C
b.
B
 

 8. 

Tropical seas have a high rate of evaporation. Because of this, the water in tropical seas will have higher:
a.
wave crests.
c.
salt concentrations.
b.
amounts of algae.
d.
daily temperatures.
 

 9. 

What is a cause of waves and currents but not tides?
a.
the sun’s cravity
c.
the moon’s gravity
b.
Earth’s gravity
d.
wind
 

 10. 

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

 11. 

The lowest point on a wave is the wave ____.
a.
tide
c.
height
b.
trough
d.
crest
 

 12. 

   The highest point of a wave is its  
a.
  crest.  
c.
  trough.  
b.
  swell.  
d.
  breaker.  
 

 13. 

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

 14. 

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
 

 15. 

How many high tides happen at Tybee Beach every day?
a.
one
c.
three
b.
two
d.
four
 

 16. 

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
d.
the amount of water that evaporates every day
 

 17. 

How often do the tides change?
a.
once a day
c.
about every 12 hours
b.
about every 6 hours
d.
whenever the Sun rises
 

 18. 

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



 
         Start Over