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Copyright © 2007 Pearson Prentice Hall, Inc. 1
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More denseYounger (< 220
Million
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More denseYounger (< 220
MillionFigure 13-7
Copyright © 2007 Pearson Prentice Hall, Inc. 2
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More dense Younger (< 220
Million)
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More dense Younger (< 220
Million)Figure 13-7
Copyright © 2007 Pearson Prentice Hall, Inc. 3
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More denseYounger (< 220 Million)
Continental CrustThicker
Less denseOlder (up to 4 billion)
vs
Oceanic CrustThinner
More denseYounger (< 220 Million)
Figure 13-7
Nature of the Ocean Floor: TopographyNature of the Ocean Floor: Topography
Convergent Boundaries = Trenches
Nature of the Ocean Floor: TopographyNature of the Ocean Floor: Topography
Mid Ocean Ridges = Divergent Boundaries
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Figure 13-7
Continents grow by collisionsForming mountains at
continent-continent convergent boundaries
Continents grow by collisionsForming mountains at
continent-continent convergent boundaries
Copyright © 2007 Pearson Prentice Hall, Inc. 7
Continents grow by collisionsForming mountains at
continent-continent convergent boundariesEx. India & Asia
Continents grow by collisionsForming mountains at
continent-continent convergent boundariesEx. India & Asia
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The continents move through time. 225 million years ago they combines into one supercontinert called “Pangea”
The continents move through time. 225 million years ago they combines into one supercontinert called “Pangea”
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Copyright © 2007 Pearson Prentice Hall, Inc. 10
Cascadia subduction zoneCascadia subduction zone
http://en.wikipedia.org/wiki/Image:Subduction.jpg
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Cascadia subduction zoneCascadia subduction zone
Copyright © 2007 Pearson Prentice Hall, Inc. 12http://www.nps.gov/archive/olym/geology/accretion.htm
Earth Quakes in the Cascadia subduction zoneNote zone with few E.Q.s = locked
= potential for very large quake (9.0+)
Earth Quakes in the Cascadia subduction zoneNote zone with few E.Q.s = locked
= potential for very large quake (9.0+)