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Waves and Tides

Multiple Choice
 

 1. 

A ____ is a kind of wave that forms when a rising tide enters a shallow, narrow river from a wide area of the sea.
a.
neap tide
c.
tidal range
b.
tidal bore
d.
spring tide
 

 2. 

Currents off the eastern coasts of continents generally flow from the ____ regions of Earth.
a.
equatorial
c.
cold
b.
temperate
d.
polar
 

 3. 

Surface currents are caused by ____.
a.
upwelling
c.
winds
b.
cold water
d.
warm water
 

 4. 

High spring tides generally result from
a.
the alignment of Earth, the Moon, and the Sun.
b.
thawing polar ice caps.
c.
heavy spring rains.
d.
mild earthquake activity.
 

 5. 

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

 6. 

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
 

 7. 

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

 8. 

The ocean's tides are caused by
a.
vibrations within Earth.
c.
heat from the Sun.
b.
strong winds.
d.
the Moon's gravity.
 

 9. 

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

 10. 

Water particles in waves actually move ____.
a.
sideways
c.
in a circle
b.
toward shore
d.
backward
 

 11. 

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

 12. 

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.
 

 13. 

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
 

 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. 

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

 16. 

What causes the water to go back into the sea after a wave breaks onto the shore?
a.
gravity
c.
Coriolis effect
b.
density
d.
friction
 

 17. 

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
 

 18. 

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

 19. 

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
 

 20. 

Waves are caused by
a.
the Moon’s gravity
c.
rivers flowing into the ocean
b.
changes in temperature
d.
the wind
 

 21. 

Which letter on this wave is the crest?
mc021-1.jpg
a.
B
c.
A
b.
C
 

 22. 

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

 23. 

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

 24. 

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
 

 25. 

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
c.
all currents are caused by the sun
d.
all currents move in the same direction
 

 26. 

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

 27. 

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

 28. 

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

 29. 

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

 30. 

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

 31. 

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
 

 32. 

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
 

 33. 

What is the cause of most ocean surface currents?
a.
the moon
c.
gravity
b.
the wind
d.
upwellings
 



 
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