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62. Which of the following sites is the least common place in which oil is trapped?<br />
a) the flanks of a salt dome<br />
b) the upper part of a lens of permeable rock<br />
c) the top of an anticline<br />
d) the bottom of a syncline<br />
63. Which of the following is a characteristic of fine-grained clastic rocks?<br />
a) most clasts are visible with the unaided eye<br />
b) the rocks are poorly sorted<br />
c) the cobbles directly rest on one another without much matrix<br />
d) the rocks tend to be easily eroded<br />
e) the rocks cannot be deposited in a marine environment<br />
64. Which kind of rock makes up the oceanic crust?<br />
a) sandstone<br />
b) limestone<br />
c) mudstone<br />
d) conglomerate or breccia<br />
e) basalt<br />
65. To determine the numerical (absolute) age of a rock, geologists can use<br />
_____________?<br />
a) Principle of superposition<br />
b) The presence of certain index fossils<br />
c) Observations of crosscutting relationships<br />
d) Measurement of radioactive decay products<br />
e) Any of the above can be used
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