The color of quartz crystals is due to
A) the arrangement of silicon and oxygen atoms.
B) inorganic impurities.
C) magnesium.
D) organic substances.
Correct Answer:
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Q23: Which of the following problems is NOT
Q24: The two major components in cement are
A)clay
Q25: Great quantities of _ have been used
Q26: Cigarette smoke and asbestos fibers act in
Q27: One of the major problems associated with
Q29: Clay consists mostly of
A)aluminum oxides.
B)aluminum hydroxides.
C)silicates.
D)carbonates.
Q30: Clays have widely varying compositions,but basically they
Q31: Which material is characterized by a double
Q32: Cement is a complex mixture of
A)calcium and
Q33: Which one of the following materials is
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