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Edible Plate Tectonics
Special thanks to Dr. Bob Lillie of the OSU Department of Geosciences who normally does this presentation as a guest lecture.
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TECTONICS:
From the Greek “tecton” (builder/ architect)The study of large features on Earth’s surface
and the processes that formed them.
Mt Jefferson, Cascade Range, Oregon
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PLATE TECTONICS:
Large features:continentsocean basinsmountain ranges
and processes:earthquakesvolcanic eruptions
due to movement of plates of Earth’s outer shell.
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Cracked Egg Shell!
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Parks and Plates©2002 Robert J. Lillie
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Divergent Plate Boundary
Parks and Plates©2002 Robert J. Lillie
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DIVERGENT Plate Boundary:Seafloor Spreading
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DIVERGENT Plate Boundary:Seafloor Spreading
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DIVERGENT Plate Boundary:Seafloor Spreading
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Seafloor Spreading & Plate Tectonics
• New ocean basins form from volcanism• Ocean floor forms IN BETWEEN pieces
that have split
http://earthobservatory.nasa.gov/Study/Tectonics/tectonics_3.html
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Convergent Plate Boundary
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CONVERGENT Plate Boundary
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Sediment and Basalt Scraped off Subducting Plate
Coastal Mountain Range
Plate Sweats
Composite Volcanoes
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Transform Plate Boundary
Parks and Plates©2002 Robert J. Lillie
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North American
Plate
Pacific
Plate
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2 inches/yearx 100 years
= 200 inches= 17 feet!
North American Plate
Pacific Plate
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Parks and Plates©2002 Robert J. Lillie
Hot Spot
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≈ 14,000 feetMauna Kea
≈ 14,000 feetMauna Loa
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14,000 feet abovesea level
TALLER THAN MOUNT EVEREST!
18,000 ft below sea
level
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Divergent Plate Boundary:Seafloor Spreading
Parks and Plates©2002 Robert J. Lillie
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Parks and Plates©2002 Robert J. Lillie
Convergent Plate Boundary:
Subduction
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Transform Plate Boundary:Transform (Strike-Slip)
Faulting
Parks and Plates©2002 Robert J. Lillie
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Parks and Plates©2002 Robert J. Lillie
Hot Spot:Plate Interior