Oil shales are sedimentary rocks that contain a solid, waxy mixture of hydrocarbons called kerogen. While they are not currently a major source of oil due to the high cost of extraction and processing, they are valuable for the kerogen that can be extracted and converted into oil through a chemical process.

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Oil Shales Are ____

Question 23

Multiple Choice

Oil shales are ____.

A) found only in North and South America
B) useful for the kerogen that can be extracted
C) less expensive to process than are conventional oil sources
D) currently producing 15 percent of the United States' oil
E) currently producing 30 percent of the United States' oil

Correct Answer: