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9 Cards in this Set
- Front
- Back
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divergent boundaries
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where new crust is generated as the plates pull away from each
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convergent boundaries
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where crust is desstroyedas one plate dives under another
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transform boundaries
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where crust s niether generated or destroyed as the plates slide horizantilly past one another
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plate boundary zones
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broad belts in which boundaries are not well definedand the effects of plateinteraction are unclear
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where do divergent boundaries occur?
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along spreading centers where plates are moving apart and new crustis created by magma pushing out of the mantle
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What is the best known of divergent boundaries?
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the mid-atlntic ridge-a submerged mt. range.
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seafloor spreading
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over the 100-200 million yrs has caused the atlantic ocean to grow from a tiny inlet of water between the continents europe africa and the americas into the vast ocean that exists today.
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what is happening in east africa?
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spreading processes have already torn saudia arabia away from the african continent forming the red sea
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what does the earths unchanging size imply?
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that the crust must be destroyed at the same rate as it is being created
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