Exam 3
Quiz Instructions
Course 34276
You have 1 hour and 30 minutes (90mins) to take the exam. There are 60 questions in total.
Waves
Question 1 1 pts
Internal waves are caused by different water densities in the ocean.
True False
Question 2 1 pts
Which of the following is the vertical distance between crest and trough?
crests troughs wavelength wave height
Question 3 1.1 pts
1/21
Question 4 1.7 pts
What is the height of the wave in the picture below?
_____________ feet
0.5 1 1.5 2
There is no wave motion beneath the wave base.
True False
Question 5 1.7 pts
What is the wavelength of the wave in the picture below?
2/21
Question 6 1.7 pts
Diameter of orbital motion increases with depth of water.
True False
___________ feet
10 20 30 40
Question 7 1.7 pts
Waves break when their steepness reaches 1/7 (or more).
There is a wave with a wave height of 3 feet and it is just breaking. What must its wavelength be?
20 feet 21 feet 22 feet
3/21
23 feet
Question 8 1.7 pts
There is a wave 10 m high and is just breaking. What must its wavelength be?
40 m 50 m 60 m 70 m
Question 9 1.7 pts
In shallow ocean waters, waves don't interact with the ocean floor.
True False
Question 10 1.7 pts
You will always find a wave base in shallow ocean waters.
True False
Question 11 1.7 pts
Waves can interfere with each other.
4/21
Question 12 1.7 pts
Waves are usually not completely parallel to the shoreline which results in movement of sand along the beach.
True False
Question 13 1.7 pts
The speed of water decreases as it gets closer to the shore.
True False
Question 14 1.7 pts
The circular orbits are larger and flatter in transitional waves than in shallow water waves.
True False
True False
Question 15 1.7 pts
Wavelength decreases closer to the shore.
5/21
Ocean Circulation
Question 16 1.7 pts
Ekman's transport is not affected by the Coriolis effect.
True False
Question 17 1.7 pts
Deep ocean currents are driven primary by __________ and caused by __________.
density differences; the Coriolis effect and land
density differences; differences in salinity and temperature latitude; differences in salinity and land
wind; the Coriolis effect and land
wind; gravity and density
True False
Question 18 1.7 pts
6/21
Question 19 1.7 pts
In the northern hemisphere, the surface currents move 90 degrees to the right of the intended wind direction.
True False
Question 20 1.7 pts
North and South equatorial currents are driven by the __________.
Coriolis force density
Ekman transport trade winds westerlies
Surface ocean currents are driven primarily by __________ and modified by __________.
density differences; the Coriolis effect and land
density differences; differences in salinity and temperature latitude; differences in salinity and land
wind; the Coriolis effect and land
wind; gravity and density
Question 21 1.7 pts
7/21
Question 22 1.7 pts
Which of the following is a western boundary current?
Benguela Current Brazil Current Canary Current California Current Peru Current
Question 23 1.7 pts
In the southern hemisphere, the direction of the Ekman transport is always __________.
parallel to the wind direction
to the east of the wind direction to the left of the wind direction to the right of the wind direction
Most water involved in deep ocean currents (thermohaline circulation) originates in high latitudes in the deep ocean waters.
True False
Question 24 1.7 pts
8/21
Question 25 1.7 pts
Each subtropical gyre is composed of how many main currents that flow into one another?
1 2 3 4 5
Question 26 1.7 pts
An increase in seawater density can be caused by a __________ in temperature or a(n) __________ in salinity.
decrease; decrease decrease; increase increase; decrease increase; increase
How many subtropical gyres are there?
1 2 3 4 5
9/21
Question 27 1.7 pts
The observation that ships and icebergs in the southern hemisphere float to the left of the wind direction is an example of which of the following?
Western intensification Equatorial upwelling Equatorial downwelling Ekman transport
Question 28 1.7 pts
Surface waters are pushed away from land and replaced by nutrient rich deep water through __________.
convergence downwelling land breezes sea breezes upwelling
LAB 8: Ocean Currents
Question 29 1.7 pts
10/21
Look at LETTER A. These currents move to the west because of which of the following winds?
polar easterlies prevailing westerlies trade winds
tropical westerlies
Question 30 1.7 pts
Use this image when answering this question.
Which coast of the United States has colder water off the coast?
11/21
Question 31 1.7 pts
Which of the following winds is controlling the direction of Drifter 2?
polar easterlies prevailing westerlies trade winds prevailing easterlies
Tides
east coast
west coast
Both the east and west coast of the United States has cold water.
Question 32 1.7 pts
What tide is represented?
12/21
Question 33 1.7 pts
When the Earth is at its greatest distance from the Sun, it's said to be at __________.
apogee aphelion perigee perihelion
Question 34 1.7 pts
Solar bulges are larger than lunar bulges.
True False
neap summer spring half
13/21
Question 36 1.7 pts
The maximum tidal range happens during __________ tides.
Fall Neap Spring Summer
Question 37 1.7 pts
The minimum tidal range happens during __________ tides.
Fall Neap Spring Winter
Question 35 1.7 pts
Tidal ranges will be greatest when the Moon is at __________.
Perihelion Aphelion Perigee Apogee
Question 38 1.7 pts
14/21
Question 39 1.7 pts
When the Sun, Moon, and Earth are aligned in a straight row, which tide will occur?
spring tide no tide back tide neap tide
What tide is represented?
neap summer spring half
15/21
Question 41 1.7 pts
During perigee, the moon appears larger.
True False
Question 42 1.7 pts
The greater the mass, the less gravitational force it has.
True False
Question 40 1.7 pts
What is a tidal range?
how high a tide is
how low a tide is
the difference between high tide and low tide the place where the tide stands still
Question 43 1.7 pts
Gravitational forces decrease as you increase the distance.
True False
16/21
Question 44 1.7 pts
Even though the Moon is closer to Earth than the Sun, the Sun still exerts more control over the tidal bugles than the Moon because of its massage size.
True False
Question 45 1.7 pts
A tidal bore is water that moves down a river and into the ocean.
True False
Coast
Question 46 1.7 pts
Southern California has several beach compartments.
True False
17/21
Question 48 1.7 pts
What is a marine terrace? What does it look like?
a balcony
steps of s staircase
Question 49 1.7 pts
All longshore drift travels up coast.
True False
Question 50 1.7 pts
Seawalls armor the coastline and protect human developments.
True False
Question 47 1.7 pts
Breakwaters are built perpendicular to the shoreline.
True False
18/21
Question 52 1.7 pts
Winter beaches ________.
are narrower than summer beaches due to high-energy waves during the winter
are wider than summer beaches due to low-energy waves during the winter
contain more sediment than summer beaches due to high-energy waves during the winter contain less sediment than summer beaches due to low-energy waves during the winter
Question 53 1.7 pts
How and why do wave-cut terraces form along a shoreline?
The shoreline is eroded by an earthquake. The shoreline is eroded by waves.
Question 51 1.7 pts
Smaller, low-energy wave move sand up the beach face toward the berm to create a ________.
summertime beach wintertime beach springtime beach autumn time beach
Question 54 1.7 pts
In the winter is when we have our worst costal erosion problems and cliff failures.
19/21
Question 55 1.7 pts
Which of the following would you expect to find on a summertime beach?
A narrow berm
A wide, sandy berm
Larger, high-energy waves
A rocky terrain along the beach
Question 56 1.7 pts
All waves travel perpendicular to the shore.
True False
Question 57 1.7 pts
All longshore currents move downcoast.
True False
True False
Question 58 1.7 pts
20/21
Question 59 1.7 pts
Strong backwash results in a narrower berm.
True False
Question 60 1.7 pts
________ protect a harbor or bay entrance and usually occurs in pairs.
groins jetties
groin fileds breakwaters
Strong swash results in a wider berm.
True False