alfred wegener (1880-1930). mid atlantic ridge mid ocean ridge system
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![Page 1: Alfred Wegener (1880-1930). Mid Atlantic Ridge Mid Ocean Ridge System](https://reader034.vdocuments.us/reader034/viewer/2022051401/56649d3f5503460f94a1843c/html5/thumbnails/1.jpg)
Alfred Wegener (1880-1930)
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Mid Atlantic Ridge
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Mid Ocean Ridge System
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Sea Floor “Stripes”
http://atlas.geo.cornell.edu/education/instructor/tectonics/polarity.html
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Convergent Margin
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Major Lithospheric Plates
Source: NASA
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Plate Configuration of PNW
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Plate Margins
• Divergent margins: spreading centers where new lithosphere (sea floor) is created
• Convergent margins: plates are moving toward each other
• Transform margins: plates move past one another without creating or destroying lithosphere
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Mantle Convection
Source: University Montpellier
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Geothermal Gradient
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Rate of Plate Movement
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Plate Margins
Source: USGS
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Juan de Fuca Ridge
Source: GSC
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Plate Margins
Source: USGS
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East African Rift
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Plate Margins
Source: USGS
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Juan de Fuca Ridge
Source: GSC
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Continental-Continental Convergence
Source: USGS
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Himalayas
Source: USGS
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Transform Margin
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Transform Faults
Left-Lateral Right-Lateral
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Alpine Fault, New Zealand
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Volcanism and Plate Margins
Source: Smithsonian
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Earthquakes and Plate Margins
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• Igneous rock types (type and location of volcanism)
• Seismic activity (type and location of earthquakes)
• Location of sedimentary basins
• Location of uplifts or mountain ranges
• Location of ocean basins
Plate Tectonics Control
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Hawaii-Emperor seamount chain
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Table
1 0.8 180 22.502 1.3
3 1.8
4 2.6
5 3.7
7 10.3
8 12
9 18.9
10 20.6
11 27.2
12 42.4
Interval Age (my) Distance (kms) Rate (cm/yr)
6 5.1
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Chart
0.00
5.00
10.00
15.00
20.00
25.00
0 1000 2000 3000 4000
Distance (km)
Rat
e (c
m/y
r)