American Public University - SCIN 138 B001

LAB Lesson 12

through 9 are based on the Lab Exercise #1: Tides.

Question1)What is the highest tide that occurred on January 20, 2010?

A.4.1 feet

B.3.7 feet

C.1.9 feet

D.0.9 feet

Question 2

Record your answer from Lab Exercise #1, What is the lowest tide that occurred on January 20, 2010?

A.4.1 feet

B.3.7 feet

C.1.9 feet

D.0.9 feet

Question 3

Record your answer from Lab Exercise #1, What is the tidal range for January 20, 2010?

A.5.0 feet

B.4.6 feet

C.3.2 feet

D.1.6 feet

Question 4

(2.86) Record your answer from Lab Exercise #1,. What is the highest tide for the month of January, 2010?

A.7.2 feet

B.6.8 feet

C.6.6 feet

D.5.8 feet

Question 5

Record your answer from Lab Exercise #1, What is the lowest tide for the month of January, 2010?

A.1.7 feet

B.1.9 feet

C.–1.7 feet

D.–0.7 feet

Question 6

Record your answer from Lab Exercise #1,. What is the tidal range for the month of January, 2010?

A.4.5 feet

B.5.1 feet

C.6.1 feet

D.8.5 feet

Question 7

Record your answer from Lab Exercise #1, How low must the water height be relative to MLLW for Elizabeth to clear the bridge?

               A.–0.3 feet

B.1.9 feet C.–1.7 feet

D.–0.7 feet

Question 8

Record your answer from Lab Exercise #1,. On which days in the first week of January, 2010, could Elizabeth plan to leave the harbor?

A.January 1, 2, 3, and 4

2. January 2, 4, and 6
3. January 1, 3, and 5
4. January 2, 3, and 6

Question 9

Record your answer from Lab Exercise #1, If she misses her window of opportunity, how many days will Elizabeth have to wait before she can leave?

A.2 days

B.4 days

C.6 days

D.10 days

Question 10

through 16 are based on the Lab Exercise #2: Wind-Driven Waves.

Record your answer from Lab Exercise #2, In how many hours should you head for the beach if you want to catch a few waves from this particular storm?

A.12 hours

B.15 hours

C.21 hours

D.25 hours

Question 11

Record your answer from Lab Exercise #2,. At what water depth (mean sea level) would the wave begin to touch bottom?

1. about 14 feet
2. about 20 feet

C.about 41 feet D.about 82 feet

Question 12

Record your answer from Lab Exercise #2,. If there were a dive boat that anchored where the water was 40 feet deep at mean sea level, what, if anything, would the scuba divers exploring the sea floor be able to feel as the waves arrive?

A.They are above the wave base and so would feel a circular movement. B.They are below the wave base and so would feel a circular movement.

3. They are above the wave base and so would not feel the waves pass through.
4. They are below the wave base and so would not feel the waves pass through.

Question 13

Record your answer from Lab Exercise #2, If the tidal range for the location were the same as for Santa Monica Bay on 01/01/2010, would the scuba divers exploring the sea bottom feel the wave during the highest tide of the day? Why or why not?

1. The divers are above the wave base and so would feel a circular movement.

2. The divers are below the wave base and so would feel a circular movement.
3. The divers are above the wave base and so would not feel the waves pass through.

               D.The divers are below the wave base and so would not feel the waves pass through.

Question 14

Record your answer from Lab Exercise #2,. If the divers were exploring the sea bottom during the lowest tide of the day, would they then feel the waves pass through?

A.The divers are above the wave base and so would feel a circular movement. B.The divers are below the wave base and so would feel a circular movement.

C.The divers are above the wave base and so would not feel the waves pass through.

D.The divers are below the wave base and so would not feel the waves pass through.

Question 15

Record your answer from Lab Exercise #2,. What happens to the wave period, wavelength, and wave height as the wave approaching the shoreline reaches a depth of water equal to its wave base? A.The period shortens, wavelength stays the same, and wave height decreases.

B.The period stays the same, wavelength shortens, and wave height decreases.

 C.The period stays the same, wavelength shortens, and wave height increases. D.The period lengthens, wavelength shortens, and wave height stays the same.

Question 16

Record your answer from Lab Exercise #2,. Waves break when the water depth is 1.3 times the wave height. If the wave breaks when it has a wave height of ten feet, how deep is the water where it breaks?

A.1.3 feet

 B.13 feet

C.26 feet

D.130 feet

Question 17

Which of the following is the definition of a shoreline? A.the total area of interaction between land and sea

B.the area of land between the highest and lowest possible water levels C.the area covered by high tide

D.any area covered by sand

Question 18

The height of a wind-driven wave depends upon wind velocity,     

A.duration, and fetch.

B.duration, and distance to shore. C.fetch, and ocean depth.

D.duration, and ocean depth.

Question 19

The depth equivalent to half a wavelength is a wave’s A.wave period.

B.wave height.

 C.fetch.

D.wave base.

Question 20

Wave base determines the water depth at which a wave will A.break.

B.“feel” the seafloor and begin to build. C.dissipate.

D.have the most erosional power.

Question 21

Which of the following is most responsible for existence of tides? A.the gravitational attraction of the sun

B.the topography of the ocean bottom

C.the gravitational attraction of the moon D.the rotation of Earth on its axis

Question 22

A steady decrease in sea level following a high tide is called a(n)                A.ebb tide.

2. flood tide.
3. spring tide.
4. neap tide.

Question 23

A steady increase in sea level following a low tide is called a(n) A.ebb tide.

B.flood tide. C.spring tide.

D.neap tide.

Question 24

When the sun and moon are aligned, their combined gravitational attractions produce a(n) A.ebb tide.

B.flood tide.

C.spring tide. D.neap tide.

Question 25

When the sun and moon are at right angles relative to Earth, they partially cancel out each other’s gravitational attractions to produce a(n)

1. ebb tide.
2. flood tide.
3. spring tide.

D.neap tide.

Question 26

 Backwash always flows

A.perpendicular to the slope of a shoreline. B.in a zigzag pattern.

C.at the wave’s angle of approach.

D.toward a rip current.

Question 27

 Longshore currents

1. are deep ocean currents.
2. are caused by changes in salinity.

C.flow in a direction parallel to the shoreline. D.are responsible for most erosional features.

Question 28

Which is NOT true of emergent coastlines? A.They are often in regions being uplifted.

B.They have very wide continental shelves. C.Their coastlines are dominated by erosional features.

D.They are typical of active margins.

Question 29

Give enough time, a sea cave is likely to erode further to become a A.tidal inlet.

B.sea arch and then a sea stack. In                 C.wave-cut terrace. D.barrier island.

Question 30

Which is NOT true of submergent coastlines?

1. Their shorelines are dominated by erosional features.
2. They are typical of passive margins.
3. Their continental shelves are relatively wide.

In

D.Land along the coast has subsided below sea level.

Question 31

Record your answer to Lab Exercise #3, Referring to the labels on Figure 12.15, identify the major coastal features in the diagram from A through H. Choose from the following terms: spit, tombolo, wave-cut platform, wave crest, wave trough, beach, longshore current, baymouth bar. (Spelling and spacing count! Write your answers identical to those given above.) Because it is unclear in the diagram, "A" is a beach.

1. Beach
2. Spit
3. Baymouth bar
4. Tombolo
5. Longshore current