The present estimate of the Earth's age is about ________ years
A) 50 million
B) 500 million
C) 2.8 billion
D) 4.6 billion
E) 2.8 trillion
Answer: D
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Which of the following geologic situations is most likely to contain significant oil concentrations?
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Placer deposits are expected in what type of rock?
A) igneous B) sedimentary C) metamorphic D) hydrothermal