EARTH: AN INTRODUCTION TO PHYSICAL GEOLOGY

Chapter 19: Deserts and Winds

Concept #5 Quiz

Choose the best possible answer to the following questions about Key Concept 5 "Wind-related sedimentary deposition."

dunes.gif
Dunes from space.

1. How does an obstacle start the formation of a “dune”?  

2. Which of the following is TRUE about sand dunes? [Hint]

3.

Match the terms for dunes with the appropriate description:  

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

A. layers of sand that are inclined in the direction the wind is blowing, or has blown
B. sand in mounds or ridges
C. the leeward side of a sand mound or ridge
 

4.

Choose the best description for each label on the photograph of a dune  

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 C appear on an image associated with this question.

5. Which of the following determines the slope of a slipface of a dune? [Hint]

6.

Match the type of dune with the appropriate description:  

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

A. a series of long ridges that are separated by troughs and oriented at right angles to the prevailing wind
B. long ridges of sand that form about parallel to the prevailing wind and where sand supplies are moderate
C. small, solitary dunes shaped like crescents and with their tips pointing downwind
D. isolated hills of sand that exhibit a complex form
E. small, solitary dunes shaped like crescents and with their tips pointing upwind, similar in shape to the result of a finger pushed along the sand
 

7.

Identify each of the indicated sand dune types by selecting the correct response.  

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 D appear on an image associated with this question.

8.

Match the type of dune with the description of how and/or where it forms:  

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

A. form where the prevailing wind varies, but stays in the same quadrant of the compass
B. form along coasts where vegetation partially covers the sand, and there are strong onshore winds and abundant sand
C. form where supplies of sand are limited and the surface is relatively flat and hard, without vegetation
D. form where wind is strongly variable, and where sand is plentiful
E. form where the prevailing wind is steady, sand is plentiful and vegetation is sparse or absent
 

9. Which type of dune is this?
large_dunes_tarbuck_shad.jpg
How about this?
desert_landscape_tarbuck_rshad.jpg [Hint]

10. Which is NOT a problem caused by the migration of dunes in desert regions?  

11. Which of the following is NOT a strong factor that influences the form and size of a dune?  

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




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