What is the likely source rock of petroleum and natural gas?
Answer to relevant QuestionsWhere in North America are petroleum and natural gas found (Fig. 7.4)?Where are the big reserves of oil shale in the United States? (See Fig. 7.5.)What is the main ore mineral of iron, and does it have an igneous, sedimentary, or metamorphic origin?Why can’t common rock be mined for elements such as copper? That is, why must high-grade deposits be found?What is the origin of the large iron ore deposits of the world? (See Fig. 7.8.)
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