Where in North America are petroleum and natural gas found (Fig. 7.4)?
Answer to relevant QuestionsWhat thickness of cover rock is generally thought necessary to generate petroleum and natural gas from organic material?What are tar sands, and where are the earth’s largest known deposits? (See Fig. 7.6.)What is the main ore mineral of aluminum, and what is its origin?Metals such as manganese, nickel, cobalt, tungsten, and vanadium are also necessary in our modern civilization. What is their main use?How many times richer is copper ore of (a) 5 percent copper, compared to the average crustal abundance of 0.0058 percent and of (b) 0.25 percent copper, the lowest grade mined?
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