Download plate boundaries

Warm up
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New ocean crust is formed at m___-o____
r_____s.
Ocean crust is subducted (destroyed) at d____
s___ t_____s.
C________n in the m____e drives plate
movement.
What is the name of the highest mountain on
Earth? At what type of boundary does it occur?
Plate Tectonics:
Plate Boundaries
Ms. Holl
Earth Science
Rowland High School
Plate Tectonics
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Plate tectonics occurs in the
LITHOSPHERE = Crust + Upper Mantle
Plate Tectonics
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Plate tectonics
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Plate
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A theory about the movement of the
continental AND the oceanic crust
A thick, shifting piece of lithosphere
Convection currents in the mantle drive
plate movement.
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View animation of mantle convection.
(2)
(7)
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(6)
(1)
(3)
(5)
(4)
7 major plates
and other smaller ones
Continental Crust
Oceanic Crust
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2 parts of each plate
Age of the Ocean Crust
YOU ARE
HERE!! (LA)
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Age of the Ocean Crust
North Pole
(LA)
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South Pole
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Features of the Ocean Floor
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Mid Ocean Ridge - MORs
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Place where new
ocean floor is created
by seafloor spreading
Deep Sea Trench
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Place where ocean floor is destroyed
Image source: http://www.uwsp.edu/geo/faculty/ritter/glossary/s_u/sea_flr_spread.html
Topography & Bathymetry
Deep Sea Trenches
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Mid Ocean Ridges
Deepest point on Earth! - Mariana Trench
Plate Tectonics
Now we have learned the EVIDENCE for the
THEORY of plate tectonics:
1.
The ocean crust is different ages
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2.
PALEOMAGNETOMETRY
ISOCHRON MAP
The ocean crust is NOT flat
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SONAR
MID OCEAN RIDGES
DEEP SEA TRENCHES
Plate Tectonics
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Goal: You will learn that…
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…there are three kinds of plate boundaries
and
there are different features associated with
each type of boundary.
Plate Boundaries
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Tectonic plates interact at plate
boundaries.
Three kinds of plate boundaries
1.
2.
3.
Transform boundary
Convergent boundary
Divergent boundary
Plate Boundaries
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Transform Boundaries
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Place where
two plates slide
horizontally
past each other
Example: San
Andreas Fault
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Convergent Boundaries
Places where two tectonic plates are moving
toward each other
1.
2.
3.
Oceanic-continental convergence
Oceanic-oceanic convergence
Continental-continental convergence
Convergent Boundaries
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Subduction - Process in which one of two
plates at a boundary descends beneath
the other.
SUBDUCTION ANIMATION
(1) Oceanic - Continental
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(1) Oceanic - Continental
Example: Peru - Andes Mountains
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(2) Oceanic - Oceanic
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(2) Oceanic - Oceanic
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Volcanic Island Arcs
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NOAA Marianas Arc Expedition
(3) Continental - Continental
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(3) Continental - Continental
Himalayan Mountains
Currently rise > 1 cm/yr
Highest Peak above sea level
- Mount Everest
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(3) Continental - Continental
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ANIMATION:
HIMALAYAS
FORMING
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Summary: Features at
Convergent Boundaries
1.
Oceanic-Continental
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2.
Oceanic-Oceanic
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3.
Trenches - Mariana Trench
Subduction zones
Mountains - Andes Mou
Volcanic island arcs - Aleutian Islands
Continental-Continental
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Mountain ranges - Himalayan Mountains
Plate Boundaries
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Tectonic plates interact at plate
boundaries.
Three kinds of plate boundaries
Plate Boundaries
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Tectonic plates interact at plate
boundaries.
Three kinds of plate boundaries
1.
Transform boundary
Plate Boundaries
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Tectonic plates interact at plate
boundaries.
Three kinds of plate boundaries
1.
2.
Transform boundary
Convergent boundary
Plate Boundaries
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Tectonic plates interact at plate
boundaries.
Three kinds of plate boundaries
1.
2.
3.
Transform boundary
Convergent boundary
Divergent boundary
Divergent Boundaries
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Place where two plates are moving apart
from each other
How a divergent boundary is formed:
(3)
(1)
Divergent boundary
Magma rises
(2)
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Rift valley
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Divergent Boundaries
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Continental-Continental
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Oceanic-Oceanic
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MID-OCEAN RIDGE
Spreading Centers
ANIMATION OF VOLCANISM
ALONG A DIVERGENT BOUNDARY
RIFT VALLEY
Divergent Boundaries
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Continental Rift Valleys
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Great Rift Valley - Africa
Rio Grande Rift - U.S.
Mississippi embayment - U.S.
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Divergent Boundaries
Great Rift Valley
in East Africa
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Divergent Boundaries
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Galapagos Spreading Center
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Plate Boundaries
Summary Animation
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Plate Tectonics
For more information -
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Plate Tectonics
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PLATE MOTION IN THE FUTURE…
Next….
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EARTHQUAKES
VOLCANOES