# Marine Science Exam "Tides"

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• 1.

### When spring tides occur, the

• A.

High tides are lower and the low tides are higher

• B.

High tides are lower and the low tides are lower

• C.

High tides are higher and the low tides are higher

• D.

High tides are higher and the low tides are lower

D. High tides are higher and the low tides are lower
Explanation
During spring tides, the gravitational pull of the moon and the sun align, resulting in a stronger gravitational force on the Earth's oceans. This causes the high tides to be higher than usual. At the same time, the low tides are lower because the water that would normally be present during low tide is pulled towards the high tide areas. Therefore, during spring tides, the high tides are higher and the low tides are lower.

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• 2.

### When the crest of a tide wave reaches the beach, it will be a

• A.

Low tide

• B.

High tide

• C.

Spring tide

• D.

Neap tide

B. High tide
Explanation
When the crest of a tide wave reaches the beach, it will be a high tide. This is because high tide occurs when the water level is at its highest point, typically caused by the gravitational pull of the moon and the sun. The crest of a tide wave represents the highest point of the wave, indicating that the water level is at its peak. Therefore, high tide is the correct answer in this context.

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• 3.

### A tidal cycle is 24 hours and 50 minutes instead of 24 hours because of

• A.

The gravitational pull of the sun

• B.

The shape and size of bays

• C.

The rotation of the moon around the earth

• D.

The large tidal range caused by spring tides

C. The rotation of the moon around the earth
Explanation
The correct answer is the rotation of the moon around the earth. The tidal cycle is not exactly 24 hours because the moon's gravitational pull causes the water on Earth's surface to bulge, creating high tides. As the Earth rotates on its axis, it takes slightly longer than 24 hours for a specific location on Earth to experience two high tides. This is because the moon also moves in its orbit around the Earth, causing a delay in the tidal cycle.

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• 4.

### Which of the following does not generally influece tides:

• A.

Depth of the water in a tidal basin

• B.

Shape of the basin

• C.

Precipitation and evaporation

• D.

Weather

C. Precipitation and evaporation
Explanation
Precipitation and evaporation do not generally influence tides. Tides are primarily caused by the gravitational forces exerted by the Moon and the Sun on Earth's oceans. The depth of the water in a tidal basin and the shape of the basin can affect the amplitude and timing of the tides, but they do not directly influence the occurrence of tides. Weather conditions such as wind and atmospheric pressure can indirectly affect tides by causing changes in sea level, but precipitation and evaporation do not have a significant impact on tides.

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• 5.

### At low tide on a sunny day, intertidal animals are faced with the following stresses:

• A.

Lack of oxygen to breath

• B.

Possibility of drying out

• C.

Increased temperature

• D.

All of these

C. Increased temperature
Explanation
At low tide on a sunny day, intertidal animals are faced with increased temperature as a stressor. During low tide, these animals are exposed to direct sunlight and the heat from the sun can quickly raise the temperature of their surroundings. This can lead to dehydration and overheating, which are significant challenges for intertidal animals to cope with. Therefore, increased temperature is a stress that intertidal animals have to deal with during low tide on a sunny day.

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• 6.

### The tidal range is the greatest when

• A.

The tidal bulges are greatest

• B.

The moon and the sun are in line and acting together

• C.

During spring tides

• D.

All of the above

D. All of the above
Explanation
The tidal range refers to the difference in water level between high tide and low tide. When the tidal bulges are greatest, it means that the gravitational pull of the moon and the sun is at its strongest, resulting in higher high tides and lower low tides. When the moon and the sun are in line and acting together, their combined gravitational forces create a stronger tidal effect. Spring tides occur when the sun, moon, and Earth are aligned, causing the highest tidal range. Therefore, all of the above options contribute to the greatest tidal range.

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• 7.

### The rhythmic rise and fall of the ocean waters is known as

• A.

A lunar day

• B.

Ocean tides

• C.

Sea level

• D.

Tidal range

B. Ocean tides
Explanation
The rhythmic rise and fall of the ocean waters is known as ocean tides. Tides are caused by the gravitational pull of the moon and the sun on the Earth's oceans. As the moon orbits the Earth, it creates a bulge of water on the side of the Earth facing the moon, causing a high tide. On the opposite side of the Earth, there is also a high tide due to the centrifugal force created by the Earth's rotation. The areas in between experience low tides. This cycle of high and low tides repeats approximately every 12 hours and 25 minutes, giving rise to the rhythmic nature of ocean tides.

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• 8.

### An area with one high tide per tidal cycle is called a

• A.

Diurnal cycle

• B.

Semidiurnal cycle

• C.

Mixed semidiurnal cycle

• D.

Neap tide

A. Diurnal cycle
Explanation
A diurnal cycle refers to an area with one high tide per tidal cycle. This means that there is only one high tide and one low tide in a 24-hour period. This type of tidal cycle is typically observed in areas where the gravitational forces of the moon and sun do not have a significant impact on the tides. In contrast, a semidiurnal cycle has two high tides and two low tides in a 24-hour period, while a mixed semidiurnal cycle has two high tides of different heights. Neap tides, on the other hand, occur when the gravitational forces of the moon and sun partially cancel each other out, resulting in lower high tides and higher low tides.

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• 9.

### tidal bulges are caused and affected by

• A.

The gravitational pull of the moon

• B.

The gravitational pull of the sun and moon

• C.

Centrifugal force

• D.

All of the above

D. All of the above
Explanation
Tidal bulges are caused and affected by the gravitational pull of the moon, the gravitational pull of the sun and moon, and centrifugal force. The gravitational pull of the moon creates a bulge on the side of the Earth facing the moon, while the gravitational pull of the sun and moon together creates another bulge on the opposite side. Additionally, the centrifugal force caused by the Earth's rotation also contributes to the formation of tidal bulges. Therefore, all of these factors play a role in the formation and movement of tidal bulges.

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• 10.

### If a very low tide occurs at 7:00 pm on may 3rd, what would the tide be called at 10:30pm on may 3rd ?

• A.

Spring

• B.

Incoming

• C.

Diurnal

• D.

Neap

• E.

Outgoing

B. Incoming
Explanation
The term "incoming" refers to a tide that is rising or coming in. Since the question states that there is a very low tide at 7:00 pm on May 3rd, it implies that the tide is currently going out or receding. Therefore, at 10:30 pm on May 3rd, the tide would be called "incoming" as it is rising again.

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• 11.

### Semidiurnal tides are characterized by

• A.

Two daily high tides, one higher than the other

• B.

One daily high tide

• C.

Two daily high tides, both of the same approximate hight

• D.

One daily high tide that is always higher than the high tide of the previous day.

C. Two daily high tides, both of the same approximate hight
Explanation
Semidiurnal tides are characterized by two daily high tides, both of the same approximate height. This means that there are two high tides and two low tides each day, with both high tides being of similar height. This pattern is commonly observed in areas where the tidal range is relatively small.

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• 12.

### Dania beach has semidiurnal tides. therefore, the beach will have

• A.

One high tide and one low tide each day

• B.

Two high tides and two low tides every 24 hours and 50 min

• C.

Two unequal high tides every 24 hours and 50 min

• D.

One daily high tide that is always higher than the high tide of the previous day.

B. Two high tides and two low tides every 24 hours and 50 min
Explanation
Dania Beach has semidiurnal tides, which means it experiences two high tides and two low tides every 24 hours and 50 minutes. This pattern occurs due to the gravitational forces of the moon and the sun. The gravitational pull causes the water level to rise, resulting in high tide, and then recede, causing low tide. The cycle repeats twice within a day, with approximately 12 hours and 25 minutes between each high tide and low tide.

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• 13.

### If low tide occurs at 12:00am on dania beach, the next high tide will occur at approximately..

• A.

12:50 the following day

• B.

12:25 pm

• C.

6:13 am

• D.

6:13 pm

B. 12:25 pm
Explanation
The answer is 12:25 pm because the tides typically occur in a regular pattern, with two high tides and two low tides occurring roughly every 24 hours and 50 minutes. Since the low tide occurred at 12:00 am, the next high tide would occur approximately 12 hours and 25 minutes later, which is 12:25 pm.

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• 14.

### A coast in the gulf of mexico experiences diurnal tides. if low tide occurs at 3 pm on monday, when would the next tide occur ?

• A.

9:12 pm Monday

• B.

3:25 am Tuesday

• C.

9:37 am Tuesday

• D.

3:50 pm tuesday

B. 3:25 am Tuesday
Explanation
The coast in the Gulf of Mexico experiences diurnal tides, which means it has one high tide and one low tide each day. Since low tide occurred at 3 pm on Monday, the next tide would be the high tide, and it would occur approximately 12 hours later. Therefore, the next tide would occur at 3 am on Tuesday. However, the given options do not include this exact time, so the closest option is 3:25 am Tuesday.

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• 15.

### Key west has mixed semidiurnal tides. if low tide occurs at 12:00 am on a key west bech, the next high tide will occur at approximately

• A.

12:50 the following day

• B.

12:25 pm`

• C.

6:13 am

• D.

6:13 pm

A. 12:50 the following day
Explanation
Key West has mixed semidiurnal tides, which means it experiences two high tides and two low tides each day, but with different heights. If low tide occurs at 12:00 am on a Key West beach, the next high tide will occur approximately 12 hours and 50 minutes later, which is why the correct answer is 12:50 the following day.

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• 16.

### Tides are actually waves

• A.

True

• B.

False

A. True
Explanation
Tides are actually waves that occur in the ocean due to the gravitational pull of the moon and the sun. These waves cause the water level to rise and fall in a regular pattern along coastlines. The gravitational force from the moon is stronger than that of the sun, resulting in two high tides and two low tides each day. Therefore, the statement "tides are actually waves" is true.

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• 17.

### During a neap tide, the high tides are lower and the low tides are higher

• A.

True

• B.

False

A. True
Explanation
During a neap tide, the gravitational forces of the Sun and the Moon act in such a way that they partially cancel each other out. This results in lower high tides and higher low tides compared to normal. The Sun and the Moon are at right angles to each other during neap tides, causing the tidal range to be smaller. Therefore, the statement "during a neap tide, the high tides are lower and the low tides are higher" is true.

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• 18.

### The wave length of a semidiurnal tide is a quarter of the circumference of the earth

• A.

True

• B.

False

B. False
Explanation
The statement that the wavelength of a semidiurnal tide is a quarter of the circumference of the Earth is false. The wavelength of a semidiurnal tide is actually half the circumference of the Earth. A semidiurnal tide occurs twice a day, meaning that there are two high tides and two low tides in a 24-hour period. The wavelength is the distance between two consecutive crests or troughs of a wave, and in the case of a semidiurnal tide, it is half the circumference of the Earth.

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• 19.

### Tidal range refers to the distance between the high tide level and low tide level on the beach.

• A.

True

• B.

False

B. False
Explanation
Tidal range does not refer to the distance between the high tide level and low tide level on the beach. Tidal range actually refers to the difference in height between the highest high tide and the lowest low tide over a certain period of time, typically a lunar day. Therefore, the statement is false.

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• 20.

• A.

True

• B.

False