20 Mountains_Fa09

20 Mountains_Fa09 - Yesterdays lahars and lava flows form...

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Yesterday’s lahars and lava flows form today’s landscapes— if you are near a volcano, you may be walking on one Lahar
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Lahars can cause lakes to form by damming rivers…here shown partially blocking river
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Deccan Plateau (Deccan Traps from Dewey's Volcano- Greenhouse theory of Dino extinction) in India
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For comparison, smaller (extinct) volcanic crater , Sonora, Mexico
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Mountain Building “OROGENESIS” =birth of mountains Grand Tetons
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So, how do we get mountains anyway? We need some plate action divergence (pulling apart) or convergence (pushing) Utah Fault block mountains Texas (divergence) (or volcanism)
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Plate boundaries and mountain building: DIVERGENT —sea-floor spreading and rift zones; can cause mountains from volcanic activity (Volcanoes) and from faulting—eg . Fault-block mountains CONVERGENT —Great for mountain building from compression, e.g. Folded mountains ; (Also Volcanoes from subduction, which are mountains too, but we already covered them.) TRANSFORM boundaries are NOT a major factor in mountain building
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the weight of the overburden. Under stress, rocks will:
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This note was uploaded on 04/09/2010 for the course GEOG 1104 at Virginia Tech.

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20 Mountains_Fa09 - Yesterdays lahars and lava flows form...

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