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8 Cards in this Set
- Front
- Back
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What did the presence of ancient glacial features in Africa, South America, India, and Australia suggest to Wegener? |
Those continents were once located in a polar region |
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Wegener's evidence suggested that the continents had been joined together in the late Paleozoic and early Mesozoic Eras. Approximately when did that occur? |
300 Million Years Ago |
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Earth's Magnetic poles do not align exactly with Earth's geographic (north, south) poles. The difference is called ________ |
Magnetic declination |
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Polar wandering is a misleading term because: |
Continents wander relative to poles; the average pole position through time is stable |
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Chose the TRUE statement: The age of the sea floor.... -Is the same as that of the continents -Is youngest at MORs and oldest farthest from MORs -Is older than 300 mya -Has been confirmed by collecting and analyzing samples obtained by sea-floor driling -Is older than the age of the continents |
Youngest at MORs and oldest farthest from MORs |
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Which is a bathymetric feature of the sea floor? -MOR -Abyssal plain -Deep ocean trenches -Seamounts -All above correct |
All are correct |
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The continental crust and ocean crust are similar in age and composition (T/F) |
FALSE |
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The age of a magnetic anomaly stripe of rock that is 200 km away from the MOR axis is 10 million years. What is the rate of seafloor spreading at this ridge, assuming that the rate is constant? |
2 cm/year |
