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21-Plates - Finish Chapter 22 Plate Tectonics II Next...

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Divergent boundaries (plates pulling apart) East African Rift Convergent boundaries (plates colliding) ocean-ocean ocean-continent continent-continent Transform boundaries (plates slipping sideways) Hot spots Mantle convection Finish Chapter 22: Plate Tectonics II Next lecture: Chapter 24
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http://geology.com/articles/east-africa-rift.shtml Rifting in East Africa is associated with upwelling of hot, deep material. This causes both extensive volcanism of various types and overall uplift, constricting the southern end of the Red Sea.
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http://geology.com/articles/east-africa-rift.shtml Although there is a lot of rifting going on in Eastern Africa, it’s not yet clear whether the Horn of Africa will ultimately split off from the rest of the continent, or if it will stay put. There are a number of examples in the geologic record of “failed rifts” where extension ultimately ceased. Breaking a continent in two is not easy! Similar features extend down the African coast. It is uncertain whether this region will eventually separate from the rest of Africa, or will stop before break, making a “failed rift”.
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The Rio Grande valley up into New Mexico and the region around New Madrid, MO are (currently) “failed rifts” in the United States. New Madrid was largely wiped out by a series of >7.5 magnitude earthquakes n 1811-1812 that temporarily caused the Mississippi River to flow backward. This earthquake map of the United States shows evidence for two areas of rifting, the Rio Grande Rift in West Texas and New Mexico, and the New Madrid Fault zone in Missouri, scene of devastating earthquakes in 1811 and 1812.
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Divergent boundaries (plates pulling apart) East African Rift Convergent boundaries (plates colliding) ocean-ocean ocean-continent continent-continent Transform boundaries (plates slipping sideways) Hot spots Mantle convection Finish Chapter 22: Plate Tectonics II Next lecture: Chapter 24
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Trenches are features in the oceanic crust, and we can see that they abut against both continents and other areas of oceanic crust.
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Revisiting the Tonga Trench
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The earthquakes viewed here along A-A’ (perpendicular to B-B’) correspond to rocks that
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