EARTH: AN INTRODUCTION TO PHYSICAL GEOLOGY

Chapter 7: Sedimentary Rocks

Concept #2 Quiz

Choose the best possible answer to the following questions about Key Concept 2 "Detrital sedimentary rocks."

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1. What minerals are most common in detrital sedimentary rocks and why? Choose all that apply. [Hint]

2.

Match the following detrital sediment types with the primary mode of lithification into sedimentary rock:  

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

A. compaction and water expulsion
B. cementation and compaction
 

3. What is the primary basis for distinguishing among various detrital sedimentary rocks? Why?  

4. Detrital grains of some mineral(s) are extremely rare in detrital sediments. Which minerals and why?  

5.

Match the detrital rock with the appropriate description:  

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

A. well-sorted, medium-size (up to 2 mm) particles, large pore spaces, accounts for about 20% of sedimentary rocks
B. silt- and clay-size particles, small pore spaces, accounts for > 50% of sedimentary rocks
C. quartz, feldspar and rock fragments dominate, poorly sorted, angular grains
D. angular large particles that are poorly sorted, few pore spaces
E. gravel- and sometimes boulder-sized particles that are poorly sorted and rounded, few pore spaces
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6. If shale is such a common rock in the sedimentary rock world, why isn't it as prominently exposed at the surface as sandstone? [Hint]

7. Select the answer that lists the common detrital sedimentary rocks in order of increasing particle size.  

8.

Label the layer with the appropriate rock type based on how the layer has weathered and mass-wasted:  

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 B appear on an image associated with this question.

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9. Using the figure below of eolian dunes, found at Great Sand Dunes National Monument in Colorado, indicate the direction the wind is blowing using the shape/symmetry of the dunes.
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10. Which of the following is a feasible explanation as to why quartz sandstone is an excellent use of “uniformitarianism” (presented in Chapter 1)?  

Some questions in this exercise may have more than one correct answer. And answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
 




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