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TEST YOUR KNOWLEDGE Answers on Page 31


Robert G. Font, CPG-03953 rgfont@cs.com


1. Consider a high-temperature mafic magma that begins to cool and in which solid mineral crystals begin to appear. Which of the following would not be expected to be part of the early stages of magmatic crystallization?


a) CaAl2Si2O8 b) KAlSi3O8 c)


Regolith Coccolith Xenolith


(Mg,Fe)2SiO4


2. The following term describes the layer of broken rock, soil, dust and other materials that overlies or covers solid bedrock: a) b) c)


3. A depositional break or hiatus of lesser magnitude than a disconformity is commonly referred to as a: a) Diatrem b)


Diapir c) Diastem 4. Eureka! We have found an irregularly-shaped, solid-gold nugget in our field work! When we immerse it into a water-filled


container, it displaces a volume of 3 cubic inches. Recall that the “unit weight” of gold (g) is 37.5 slugs per cubic foot. If the current gold price is set at $1,100.00 per ounce, how much is our nugget worth (Ng$)? a)


b) c)


$20,023.90 $28,973.83 $36,924.80


d) Man, this is critical! I need every penny that I can get!


5. The silicon tetrahedron is the basic block of the “silicates,” the most abundant minerals that are found in the Earth’s  


a) 32 b) 54 c) Are you serious? I’ve had it! I’m a geologist, not a mathematician!


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Apr.May.Jun 2016  TPG 29


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