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Soil Genesis and Development, Lesson 1 - Rocks, Minerals, and Soils

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1.6 - Rock Identification Exercise

Your parents are cleaning out the attic and find your ancestor’s rock collection. All you know about him is that he came over from Germany in 1812, starting the family farm soon thereafter. It seems that he was quite the naturalist, carefully studying the rocks and soils on and around his property. Too bad that all his notes are in German, and you can’t read any of it (should have taken German in high school.) So, at the request of your parents, you put your college education to good use, pick up the tray of rocks, and head off to the geology department to do some rock identifications. Here is his rock collection. Use your new knowledge of rocks to identify the specimens. 


Click below on your old class notes to help you determine the mineral content.


Class Notes
(Click on the Image)



 
Image by C. Geiss
 
 
Question 4:  This rock consists of thin platy shards and breaks easily.  It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary


 

Image by C. Geiss
Question 5:  A soil developed from this grainy, quartz-rich rock may have problems because it will......

A.  have low fertility.
B.  be very acidic.
C.  have excessively high clay
         content





Image by C. Geiss
Question 6:  This light colored rock contains nice black swirls of biotite. It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary




Image by C. Geiss
Question 7:  This rock is black to dark gray and contains a lot of bubbles.  It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary





Image by C. Geiss
Question 8:  This light gray rock contains an abundance of fossils.  It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary



Image by C. Geiss
Question 9:  A soil developed from this rock will likely be...

A.  alkaline
B.  infertile
C.  sandy





Image by C. Geiss
Question 10:  This light-colored rock consists of small, randomly oriented crystals.  It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary




Image by C. Geiss
Question 11:  This crumbly rock displays nice brown and green layers.  It is...

A.  Igneous
B.  Metamorphic
C.  Sedimentary




 



 

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