Term
midoceanic ridge system
[image]
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Definition
a chain of volcanoes and rift valleys about
40,000 miles long that rings the planet
like the seams of a giant baseball. |
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Term
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Definition
| runs parallel to the coasts of Europe and Africa and of North and South America and is located halfway between them. |
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Term
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Definition
-thin on and near the ridge
-found away from the ridge thickens and contains progressively older fossils. |
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Term
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Definition
| lava had erupted and cooled, locking into the rocks a residual magnetic field whose direction matched that of Earth. |
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Term
| what strong support did Au provide? |
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Definition
| for the idea of seafloor spreading because the lava in these stripes can be dated independently and because regions of reversed polarity correspond with times of known geomagnetic field reversals. |
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