Download continental mountain ranges

Plate Boundaries
Continental Drift Review
• Breakup of Pangaea
• Future Plate Movement Animation
Sea Floor Spreading
• http://www.classzone.com/books/earth_sci
ence/terc/content/visualizations/es0803/es
0803page01.cfm?chapter_no=visualizatio
n
What causes plates to move?
A- Ridge push- Material from mid-ocean
ridges pushes the plates
B- Convection Currents- in the mantle,
molten rock rises, cools, then sinks,
pushing the plates with the current
C- Slab Pull- Gravity pulls cooler, denser
plates into mantle
Diagram
Plate Boundaries
• Convergent- “coming together”
• Divergent- “separating”
• Transform- “scraping past”
Convergent Boundaries
• There are 3 types:
– Continental-Continental
– Continental-Oceanic
– Oceanic-Oceanic
Continental-Continental Collisions
• Responsible for creating…
–
continental mountain ranges
• Examples:
– Himalayas
– The Alps
Continental-Continental Collisions
DIAGRAM
Convergent boundary
MANTLE
(Asthenosphere)
Mountain
Range
2 converging continental plates
2 converging continental plates
Continental-Oceanic Collisions
• Also called a Subduction zone
• Responsible for creating…
– Volcano ranges
– Oceanic Trenches (write this in)
• Example:
– Cascade Range (WA and OR)
– Andes mountains
Continental-Oceanic Collisions
Diagram
Trench
Oceanic Plate
MANTLE
(Asthenosphere)
Continental Crust
Convergent boundary
-subduction zone-
The Andes Mountains
Trench
Oceanic-Oceanic Collisions
• Responsible for creating…
– Volcanic Island Chains
– Oceanic Trenches
• Examples– Japan, The Phillipines
– Mariana Trench in the Pacific Ocean
Oceanic-Oceanic Collisions
Diagram
Trench
Oceanic Plate
MANTLE
(Asthenosphere)
Oceanic Plate
http://www.platetectonics.com/book/images/Convergence2.gif
http://www.dkimages.com/discover/previews/875/20120887.JPG
Mariana Trench-
http://upload.wikimedia.org/wikipedia/commons/1/13/Mariana_trench_location.jpg
Divergent Boundaries
“When plates go their separate
ways…”
Divergent Boundaries
• Occur when two tectonic plates separate
from each other
• Responsible for
– Sea-floor spreading
– Mid-ocean ridges
– Rift valley (on land)
• Examples: Mid-Atlantic Ridge (oceanic);
Great Rift Valley (E. Africa)
Divergent Boundary
Parting is
such sweet
sorrow…
Diagram
PLATE
PLATE
MANTLE
(Asthenosphere)
Divergent boundary
-Two plates move apart-
Animation
http://www2.nature.nps.gov/GEOLOGY/usgs
nps/animate/A48.gif
Mid-Atlantic Ridge
Great Rift Valley
earth.imagico.de/views/eafrica_large.jpg
Transform Boundaries
“friction never felt so good”
(unless you live in California)
Transform Boundary
• Occur when two tectonic plates scrape
past each other horizontally
• Responsible for most earthquakes
– Earthquakes can occur at any plate boundary
• Example: San Andreas Fault, CA
Transform Boundary
Diagram
San Andreas Fault, CA
http://nationalatlas.gov/articles/geology/features/images/sanandreas.jpg
http://pubs.usgs.gov/gip/dynamic/graphics/San_Andreas.gif
Wrapping Up
• http://www.classzone.com/books/earth_sci
ence/terc/content/visualizations/es0804/es
0804page01.cfm?chapter_no=visualizatio
n