Page 141 - Laboratory Manual in Physical Geology
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A CTIVIT Y 4.2 What Are Rocks Made Of?
Name: ______________________________________ Course/Section: ______________________ Date: ___________
A. What is the difference between in situ mineral grains and detrital mineral grains?
B. REFLECT& DISCUSS Rocks are made of the materials listed below and described on page 115 . Below each sample,
write the name of every kind of material it contains from the list below. (All samples are x1.) Be prepared to compare your
observations with the observations of the other geologists.
Mineral grains ( in situ ) Clasts (detrital minerals) Gravel Silt Glass
Mineral grains (detrital) Clasts (rock fragments) Sand Clay Bioclasts
1 2 3
4 5 6
7 8 9
122
