Define a fossil and list the ways that fossils form. Explain why fossils are usually found in sedimentary rocks rather than in igneous or metamorphic rocks
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Fossils: remains of organisms preserved in rock. Fossils form as preserved remains of shelly organisms, replaced cellular material, or impressions. Igneous environments too hot for life if extrusive (although extremely rare occurrences of volcanic fossils exist), and there is no life in intrusive environments. Metamorphic processes alter sedimentary rocks and therefore any fossils. Sedimentary rocks are formed at the appropriate temperatures, pressures for life.
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In order for a terrane to become attached to a continent, it typically
A) is shifted there suddenly by an earthquake. B) originated as a meteor that fell over a continent. C) becomes scraped of a subducting plate. D) is transported by a glacier. E) results from the collision of two continental plates.
What is a hypothesis? How does it differ from a theory?
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What is an elastic material?
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The increasing gap in economic conditions between regions is described as
A) balance of power. B) trade theory. C) uneven development. D) capitalism. E) resource exploitation.