Deck 10: Tides

Question 1

A tide pattern of one high and one low each day describes a ____.

A)diurnal tide
B)mixed tide
C)solar tide
D)semidiurnal tide

Answer 1

A

Question 2

The type of tide associated with the full and new moons are ____.

A)neap tides
B)spring tides
C)diurnal tides
D)tidal currents

Answer 2

B

Question 3

Tidal bores usually occur ____.

A)in river inlets or long narrow bays
B)in open ocean far from land
C)around islands
D)in enclosed basins such as the Mediterranean

Answer 3

A

Question 4

Who developed the gravitational model of tides known as the equilibrium theory?

A)Laplace
B)Newton
C)Einstein
D)Cook

Question 5

The side of Earth facing the moon will experience a high tide, while the opposite side of Earth will have a ____.

A)low tide
B)time of no tidal action
C)high tide also
D)tide that cannot be predicted

Question 6

The zero point on a tide graph is called the ____.

A)slack water point
B)mean sea level point
C)node point
D)tidal datum

Question 7

When the sun, moon, and Earth are all in a line, the ____.

A)gravitational attraction will be less
B)difference between high and low tides will be minimal
C)arrival of high tide will be delayed
D)highest high and lowest low tides will occur

Question 8

Which of the following statements is true concerning tides?

A)because tides travel across the ocean, the crests and troughs that cause high and low tides are very large.
B)tidal bulges only occur on the side of Earth that is facing the moon.
C)the combined forces of gravity and inertia result in tides.
D)the atmosphere is the only influence on tides.

Question 9

Which statements is true concerning the equilibrium theory of tides?

A)The theory assumes that the seafloor greatly influence tides.
B)The theory states that the surface of the ocean cannot conform to the combination of forces acting on it.
C)The theory presumes that the ocean conforms instantly to the forces that affect the position of its surface.
D)The theory presumes that the ocean surface is never in equilibrium with the forces acting on it.

Question 10

Slack water occurs ____.

A)at high tide
B)at low tide
C)when the current is changing direction
D)midway between high and low tide

Question 11

The difference between high water (high tide)and low water (low tide)is the ____.

A)tidal bore
B)tidal wave
C)tidal range
D)amphidromic point

Question 12

Tides caused by the inertia and the gravitational force of the sun and moon are called ____.

A)neap tides
B)astronomical tides
C)tidal surge
D)meteorological tides

Question 13

The time between high and low tide when the current changes direction is called ____.

A)ebb water
B)flood tides
C)slack water
D)amphidromic points

Question 14

The primary forces that cause tides in the sea are ____.

A)coastal earthquakes and landslides
B)wind and storms at sea
C)the gravitational attraction of the moon and the sun
D)the gravitational attraction of Mars and Venus

Question 15

Which body has the greatest influence on ocean tides?

A)Sun
B)Moon
C)Jupiter
D)Venus

Question 16

Which of the following is true about a tidal current?

A)The velocity of a tidal current increases with depth.
B)The velocity is always greater in the open ocean away from land.
C)Tidal currents reach maximum velocity midway between high tide and low tide.
D)Tidal currents only approach shore during a storm surge.

Question 17

Which statement best characterizes neap tides?

A)Neap tides occur when the moon, Earth and sun form a right angle.
B)Neap tides represent extreme tidal ranges.
C)Neap tides occur at the new and full moons every month.
D)Neap tides correspond with the timing of spring tides.

Question 18

The tidal pattern characteristic of the west coast of the United States is ____.

A)mixed tides
B)diurnal tides
C)reversing tides
D)amphidromic tides

Question 19

The longest of all ocean waves are called ____.

A)tsunami
B)tides
C)storm surge
D)wind wave

Question 20

The reference level to which tidal height is compared is called the ____.

A)sea level of spring tides
B)tidal datum
C)maximum range
D)tidal variance

Question 21

The only marine energy source being successfully exploited on a large scale is ____.

A)tidal power
B)storm waves
C)salinity differences
D)thermal gradient

Question 22

Tides are long waves that are generated by gravity and inertia.

Question 23

Which of the following is true with regard to tidal power?

A)Operating costs are high.
B)If power stations were built at every appropriate site, the power generated would fulfill the entire world's needs.
C)The source of power is free.
D)Tidal power generation results in the release of pollutants and greenhouse gasses into the atmosphere.

Question 24

In the Northern Hemisphere, spring tides have greater ranges in the winter than they do in the summer.

Question 25

Water rushing into an enclosed area because of the rise in sea level as a tide crest approaches is called a(n)____.

A)an ebb current
B)a flood current
C)slack water
D)a neap tide

Question 26

Most of the world's coasts have ____ tides.

A)semidiurnal
B)mixed diurnal
C)diurnal
D)mixed node

Question 27

A low tide corresponds to the trough of the wave.

Question 28

Tidal bulges are formed as the moon's gravity pulls the surface of the ocean towards the moon.

Question 29

An amphidromic point is a ____.

A)no tide point in the ocean around which the tide crest rotates through one tidal cycle
B)place in the ocean where tides are highest
C)place in the ocean where tidal datum is displaced to the right (in the Northern Hemisphere), or to the south (in the Southern Hemisphere)
D)no tide point at the coast where there is a daily high tide, but no low tide

Question 30

A meteorological tide can be caused by ____.

A)rogue waves
B)storms
C)ebb currents
D)gravity and inertia

Question 31

The rise and fall in sea level as a tide crest approaches and passes will cause a(n)____.

A)tidal bore
B)tidal wave
C)ebb current
D)tidal current

Question 32

The height of the ocean averaged over a few years' time is called ____.

A)mean high water
B)mean low water
C)tidal datum
D)mean sea level

Question 33

A steep wave moving upstream generated by the action of the tide crest in the enclosed area of a river mouth is called a ____.

A)tidal node
B)tidal wave
C)tidal surge
D)tidal current

Question 34

A tidal or lunar day is exactly 24 hours long.

Question 35

The grunion is a type of fish that swims ashore right after the highest spring tides to lay eggs beneath the sand.

Question 36

A neap tide has a the highest high tides and the lowest low tides.

Question 37

There can only be one high tide and one low tide per tidal day for any given area.

Question 38

Which statement is true concerning a lunar day?

A)A lunar day is shorter than a solar day.
B)A lunar day represents the time between when the moon is highest in the sky and the next time it is highest in the sky.
C)A lunar day is 26 hours.
D)Because of the length of a lunar day, lunar tides usually arrive 30 minutes earlier each day.

Question 39

For tides, the amphidromic point corresponds to the wave crest.

Question 40

Because of the combination of gravitational and inertial forces, tides are unpredictable.

Question 41

Explain the relative influence of the sun and the moon on tides.

Question 42

Can tides be predicted? Explain why or why not and give examples of factors that may render tidal predictions inaccurate.

Question 43

How can tidal energy be used by humans?

Question 44

Tides are shallow-water waves. Explain this statement.

Question 45

What are the amphidromic points of the world ocean, and approximately how many are known to exist?