Multiple Choice
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1.
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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 |
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2.
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Currents off the eastern coasts of continents
generally flow from the ____ regions of Earth.
a. | equatorial | c. | cold | b. | temperate | d. | polar |
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3.
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Surface currents are caused by ____.
a. | upwelling | c. | winds | b. | cold
water | d. | warm water |
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4.
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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. |
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5.
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What causes the Corriolis effect?
a. | the Earth’s rotation | c. | the wind | b. | the global
conveyor belt |
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6.
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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 |
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7.
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Wavelength is the distance between two wave
____.
a. | crests | c. | tides | b. | particles | d. | breakers |
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8.
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The ocean's tides are caused by
a. | vibrations within Earth. | c. | heat from the Sun. | b. | strong
winds. | d. | the Moon's gravity. |
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9.
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The Gulf Stream delivers warm water to what
region?
a. | Hawaii | c. | the
East Coast of North America | b. | Western
Europe |
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10.
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Water particles in waves actually move
____.
a. | sideways | c. | in a
circle | b. | toward shore | d. | backward |
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11.
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What do you call the distance between two wave
crests?
a. | frequency | c. | wavelength | b. | amplitude |
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12.
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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. |
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13.
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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 |
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14.
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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 |
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15.
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What type of currents will flow along the ocean
floor?
a. | surface currents | c. | gyres | b. | density
currents | d. | prevailing winds |
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16.
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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 |
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17.
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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 |
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18.
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How many high tides happen to the same spot each
day?
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19.
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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 |
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20.
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Waves are caused by
a. | the Moon’s gravity | c. | rivers flowing into the ocean | b. | changes in temperature | d. | the
wind |
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21.
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Which letter on this wave is the crest?
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22.
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What causes the tides?
a. | coriolis effect | c. | the
pull of gravity between the Earth, Moon, and the Sun | b. | wind |
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23.
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The lowest point on a wave is the wave
____.
a. | tide | c. | height | b. | trough | d. | crest |
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24.
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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 |
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25.
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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 |
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26.
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What is the main force that drives surface
currents?
a. | the Moon | c. | geothermal energy | b. | the
wind |
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27.
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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 |
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28.
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Which of these causes ocean waves?
a. | the wind | c. | the
moon's gravity | b. | density
differences | d. | the Sun’s Gravity |
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29.
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When the Sun, Moon, and Earth form a 90°
angle, we have ____ tides.
a. | spring | c. | fall | b. | normal | d. | neap |
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30.
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Surface currents can affect ____.
a. | low tides | c. | the
ocean bottom | b. | the climate on
continents | d. | high tides |
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31.
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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 |
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32.
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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 |
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33.
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What is the cause of most ocean surface
currents?
a. | the moon | c. | gravity | b. | the
wind | d. | upwellings |
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