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Online Quiz
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1
Waves approaching a beach at an angle
A)cause sand to move along the beach
B)are refracted so that they become nearly parallel to the beach
C)cause a longshore current to develop
D)all of the above
2
Wave base is the water depth where
A)deep water waves become shallow water waves
B)waves break
C)wave height is less than water depth
D)waves are formed
3
Over several years, sand in the beach and surf zones
A)moves parallel to shore
B)does not move appreciably
C)is transported as dissolved load
D)moves toward shore
4
How is the shape of a shoreline affected by the natural aging process?
A)it becomes more irregular
B)it gets longer
C)it becomes straighter
D)it does not change
5
You own shoreline property on a coast where the longshore current is dominantly south to north. After an absence of a year, you returned to find that your boat dock no longer reached the water, but was surrounded by beach sand. What is the most likely explanation?
A)the neighbor to the north built a jetty or breakwater
B)the neighbor to the south built a jetty or breakwater
C)a dam was built in a nearby river
D)sea level rose several feet higher
6
Wave refraction occurs
A)in deep water
B)as a result of longshore current
C)only along straight beaches
D)when wave-induced orbital motion of water affects the bottom
7
Wave refraction is the process which
A)concentrates wave energy on pocket beaches (bays)
B)causes deep water waves to move faster
C)causes shallow water waves to bend
D)all of the above
8
Wave energy comes from
A)tides
B)wind
C)ocean currents
D)longshore currents
9
Beach erosion can be caused by
A)interruption of longshore currents
B)deposition of stream sediment
C)deep water waves
D)lowered water level
10
Wave energy along coastlines is concentrated
A)on headlands
B)in bays
C)near river mouths
D)in submarine canyons
11
Shore erosion is intensified by
A)declining water level
B)waves with shorter wavelength
C)rising water level
D)summer weather
12
A longshore current
A)carries sand down a deep sea canyon and away from shore
B)flows out to sea from the mouth of a river
C)forms where waves approach the beach at an angle
D)all of the above
13
Which is most easily eroded by wave action?
A)sea wall
B)barrier island
C)groin
D)breakwater
14
Tidal energy comes from
A)gravity
B)wind
C)ocean currents
D)longshore currents
15
A wave-cut platform could be evidence of
A)higher sea level in the past
B)lower sea level in the past
C)longshore current activity
D)changing tides
16
A drowned valley could be evidence of
A)higher sea level in the past
B)lower sea level in the past
C)longshore current activity
D)changing tides
17
Which part of a coastline is most likely to contain coastal cliffs?
A)bay
B)barrier island
C)headland
D)delta
18
Most barrier islands
A)are stable
B)are sinking
C)are gradually moving seaward
D)are gradually moving landward
19
Most drowned valleys contain
A)deltas
B)estuaries
C)barrier islands
D)all of the above
20
Why is the sea level dropping in certain places like Scandinavia?
A)global warming
B)shoreline erosion
C)sediment deposition
D)postglacial rebound
21
Why is the sea level dropping in much of the world?
A)global warming
B)shoreline erosion
C)sediment deposition
D)postglacial rebound
22
Temporary sea-level rise due to a hurricane is called
A)tsunami
B)surge
C)neap tide
D)spring tide





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