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10 Cards in this Set
- Front
- Back
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What evidence did Wegner use to support his hypothesis of continental drift?
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glacier debris in Africa, mountains of similar age in North America and Scotland, identical fossils found in South America and Africa
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What happened about 250 million years ago according to Wegner?
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the supercontinent began to breakup
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What is the reversal time scale and what is it used to create?
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a pattern of alternating normal and reversed polarity in rocks
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Modern climates are a result of past movements of what?
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tectonic plates
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Is the sediment that is closer to a mid-ocean ridge older or younger than that found further away?
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it is younger
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Give an example of a transform boundary:
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San Andreas Fault in California
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What is slab pull?
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the force exerted by the leading edge of a subducting plate
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When do major mountain chains form?
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when terranes and continents collide
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Why does Madagascar have unique species of plants and animals?
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It has been isolated for millions of years
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What is isostasy?
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gravitational and buoyant equilibrium
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