Plate Tectonics

1
Plate Tectonics

• By J. Farr

2
Harry Hesss theory of Sea floor spreading

• Sea floor spreads apart
• Magma moves upward and flows through the cracks

3
Pangaea

• http//www.ig.utexas.edu/research/projects/plates/
  images/pangea.jpg

4
Divergent Boundary
Definition Two Plates moving apart

• dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm

5
Convergent Boundary

• Oceanic Plate is forced under the less dense
  Continental Plate.

courses.unt.edu/.../ exam1images/Fg16_09b.jpg600
x 400 pixels - 131k
6
Transform Boundary

• Two plates slide past one another

7
Wegeners Theory

• Provided evidence of Continental drift but,
  didnt know how or why.

8
Effects of Plate Tectonics

• Fault Block Mountains
• Strike Slip faults
• Mountains
• Volcanoes
• Earthquakes

9
Fault Block Mountain

• Diverging Plates
• Ex The Great Rift Valley of Africa

http//www.longitudebooks.com/images/book_large/EA
F91.jpg
10
Strike Slip Faults Cause Earthquakes

• One plate is sliding past another.
• Ex San Andreas Fault
• Plates move suddenly and vibrations are felt
  within Earth which are felt as Earthquakes

11
Converging Continental Plates

• Plates move together
• Force causes folding of rock layers
• These become Mountain Ranges

12
Converging Oceanic Plates

• One plate slides under the other
• Melting occurs
• Volcanoes are formed
• Entire Mountain Ranges can be formed

13
Fun Fact

• Hawaii is moving towards Japan at a rate of 8.3cm
  per year.

14
Quiz

• What are the 3 different types of boundaries that
  occur with Sea Floor Spreading?
• What are some of the effects of Plate tectonics?

15
Bibliography

• California Content Standards
• http//www.cde.ca.gov/cfir/
• 6th Grade Standards
•   
• Pangea
• http//www.ig.utexas.edu/research/projects/plates/
  images/pangea.jpg
• Diagram of Pangea
•  
• Convergent Boundary
• courses.unt.edu/.../ exam1images/Fg16_09b.jpg600
  x 400 pixels - 131k
• Divergent Boundary
•  dl.ccc.cccd.edu/.../ geology100/IntroLecture1.htm
  
• Great Rift Valley of Africa
• http//www.longitudebooks.com/images/book_large/EA
  F91.jpg
• The Way The Earth Works
• http//www.lhsgems.org/images/Tectonics.gif