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divergentboundaries_tarbuck - Review Plate Boundaries •...

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Review Plate Boundaries Divergent Convergent
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Mountain Ranges and Volcanoes The type of boundary affects what kind of mountains will occur at a location The composition of magma determines the type of volcano that will occur at a location
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I. Oceanic Divergent Boundaries A. How we study Sonar Multibeam sonar Fig 13.2a
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Figure 13.2B
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What we learn from sonar Figure 13.3
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I.B. Geologic Activity Spreading Centers Rock generation Rifting Faulting Eruptions Earthquakes (shallow) Biological Hot springs Subsidence – as move away from ridge
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Rock Generation Figure 13.19
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Faulting near mid-ocean ridges Normal faulting Produces horsts and grabens Series of ridges and valleys Called Abyssal Hills
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Figure 13.6
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Figure 13.15
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Tubal Worms Figure 13.E
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I.C. Mountain Range Characteristics Broad areas of “swelling” Ridge valleys – in some cases Depend upon spreading rates Fracturing along edges of ridge Abyssal hills Fissures Volcanoes Seamounts
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Figure 13.15
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Figure 13.14A: slow rates < 5 cm/year
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Figure 13.14B: fast rates > 9 cm/year
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Figure 13.16
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Mid-Atlantic Ridge
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Oceanic Rifting Mid Atlantic Ridge in Iceland
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jokulhaulp - meltwater causing huge volumes of glacial flood water Iceland jokulhaulp – November 5, 1996
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II. Continental Divergent Boundaries
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