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Sedimentary Rocks



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Question 1
Sedimentary rocks can form:    
Correct Answer:
all of the above are true    
   
Question 2            
Choose the proper listing of detritus terms, going from smallest to largest of the words offered    
Correct Answer:  mud, silt, sand

 Question 3      
Which statement is true?
Pieces of broken rock produced by physical weathering are collectively called detritus    
Correct Answer:
Pieces of broken rock produced by physical weathering are collectively called detritus    

Question 4            
Which is not a "soil term"?
Correct Answer:  arkose
   
Question 5      
A nonmarine clastic sedimentary rock composed of angular fragments surrounded by matrix is:
Correct Answer:  breccia    

Question 6      
A clastic sedimentary rock with clay and silt-sized grains that breaks in thin sheets is called:    
Correct Answer:  shale    

Question 7      
Which term has nothing to do with the mineral calcite?
Correct Answer:  chert

 Question 8      
The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter derived from plankton and algae remains is:
Correct Answer: oil shale    

Question 9      
Which statement is true?
Correct Answer:  All of the above are true statements    

Question 10      
Ripple marks on a bedding plane:
Correct Answer:  could suggest an ancient stream bed or a seashore
   
Question 11      
What is the most logical past environment to have produced a deposit consisting of layers of well-sorted sandstone with cross beds several meters high?
Correct Answer:  sand dunes

 Question 12      
What is the most logical past environment to have produced a deposit consisting of layers of unsorted, unstratified sedimentary clasts, clay-sized to boulder-sized?
Correct Answer:
glacial valley

 Question 13      
What is the most logical past environment to have produced a deposit consisting of very little sand and mud, but instead lots of broken-up carbonate shells of marine organisms?
Correct Answer: shallow-water carbonate area

 Question 14            
The structure that may form where a stream enters a lake:
Correct Answer:  all of the above are true statements    

Question 15      
Which of the following sedimentary features is the surest indicator that the past environment there was subaerial (under air), not submarine (underwater)?
Correct Answer:  mud cracks

 Question 16      
Sedimentary rocks form only at or near Earth's surface, never at great depths    
Correct Answer: True

 Question 17      
The words weathering and erosion are synonyms; they can be used interchangeably    
Correct Answer: False

 Question 18      
Graywacke and conglomerate are examples of well-sorted rocks; shales and fine-grained sandstone are examples of poorly sorted rocks    
Correct Answer: False

 Question 19      
A rock with large, angular fragments and lots of feldspar is classified as immature; a rock with smaller, rounded grains and not much feldspar is classified as mature    
Correct Answer: True

 Question 20      
The formation of dolostone, due to the introduction of magnesium into limestone, is an example of diagenesis    
Correct Answer: True

 Question 21      
The presence of redbeds indicates the sediments lithified in water and this caused the iron to rust    
Correct Answer: False

 Question 22      
Diagenesis and metamorphism both alter the texture and mineral composition of rock; metamorphism is the more extreme process    
Correct Answer: True

 Question 23      
A sequence of sedimentary beds, distinctive enough to be recognized as a unit called a stratigraphic formation, gives clues to the past environment that produced it    
Correct Answer: True

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