TEST YOUR KNOWLEDGE Answers on Page 38
Robert G. Font, CPG-03953
robertfontphd@gmail.com
1. A sandstone is composed of 64% potassium feldspar, 28% quartz, 8% plagioclase feldspar and 4% miscellaneous rock frag- ments. How should it be classified?
a) Arkose. b) Arenite. c) Litharenite. d) Dude, I don’t go for sandstones! Evaporites rule!
2. This clay is a 2:1 structure made up of 2 silicon tetrahedra and one aluminum octahedron, where the units are bonded by potassium cations and diagnostic x-ray peaks are seen at about 10.0, 4.5 and 3.3 angstroms:
a) Illite. b) Smectite. c) Kaolinite. d) None of these “ites” for me! Just give me silly putty and let me play!
3. In geomechanics and structural geology, which type of rock behavior is indicated when the stress required to continue deformation rises as the strain increases?
a) Ductile. b) Brittle. c) Work hardening.
d) Hey hombre, I’ve never heard of rocks behaving (and misbehaving). I think you had one too many adult bever- ages…..
4. One of these is not a stage of the Cretaceous period: a) Aptian. b) Toarcian. c) Albian.
d) Dude, I dun’t mimirize this stoff! I are a hololocene xprt miselph!
5. In our studies of geophysics and geodetics, we wish to calculate the velocity at which the Earth moves around the Sun. To a first approximation, if the average dis- tance between the Earth and Sun is about 149,600,000 kilometers and considering a circular orbit, what is this
velocity in miles per hour? a) 670 mph. b) 6,700 mph. c) 67,000 mph. d) Help!!!!!! Let me out of this column!!!!
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