EARTH: AN INTRODUCTION TO PHYSICAL GEOLOGY

Chapter 20: Shorelines

Concept #5 Quiz

Choose the best possible answer to the following questions about Key Concept 5 "Stabilization of the shore."

14fig17.gif

1. Although the same processes cause change along every coast, not all coasts respond in the same way. Which of the following is NOT considered a local factor in determining how a coastal area responds to those processes? [Hint]

2.

Match the type of shore stabilization technique with the appropriate description:  

Using the pulldown boxes, match each item on the left to the corresponding item at right.

A. built parallel to the shoreline to protect boats from the force of waves, creating a quiet water zone near the shoreline
B. built parallel to the shoreline to armor the coast and defend property from the force of waves, and reflecting the waves back out to sea
C. built in pairs and extend into the ocean at the entrances to rivers and harbors
D. a barrier built at a right angle to the beach to trap sand that is moving parallel to the shore
 [Hint]
 

3.

Match the labels on the diagram with the appropriate description.  

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.

The letters A through F appear on an image associated with this question.

4.

Match the type of shore stabilization technique with the potentially new problems it causes:  

Using the pulldown boxes, match each item on the left to the corresponding item at right.

A. reduced wave activity between the coast and the structure allows sand to accumulate out to the feature, thus making the structure ineffective at protecting the shoreline from the force of waves
B. the beach may be eliminated between the structure and the shore due to the lack of wave activity caused by the existence of the structure
C. as a singular structure, the upstream part catches sediment, while the downstream part is sediment starved, causing the beach to be eroded completely away there
D. as a paired structure, the upstream part catches sediment, while the downstream part is sediment starved, causing the beach to be eroded completely away there
 [Hint]
 

5. 14fig17a.gif

The shore stabilization features shown in the photograph are “groins.” According to what you observe, which direction is the longshore current along this shoreline, and how do you know?  

6. Which of the following would NOT likely be an effect of a breakwater?  

7. Why are the alternatives to “hard” stabilization of shorelines, like “beach nourishment” and “relocation,” still problematic, and the beach may not be saved anyway?  

8. The rapidly escalating cost of coastal storm damage in the United States is due mainly to which of the following? [Hint]

Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
 




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