HPU NCS2200 earth science for elementary education majors summer online course plate boundary types lecture part 2

1. Plate boundary types
• Divergent Plates
– Plates move away from each other
– Crust is created
– Mid ocean ridge – rift valleys
• Convergent Plates
– Plates move toward each other
– Crust is destroyed
• Two types
– Subduction
» Oceanic-oceanic
» Oceanic-continental
– Mountain Building
» Continental-continental
• Transform Plates
– Plates slide past each other in opposite direction
• Crust is neither created nor destroyed

2. Tectonic Plate Boundaries

3. Pacific Ocean boundaries
divergent
subduction
subduction

4. Convergent Plate zones
• Ocean-Continental
Subduction zone
– Crust is destroyed
– Ocean trench
– Volcanic arc
• Continental-
Continental boundary
– Mountains are built
– Crust is destroyed

5. Parts of Subduction zone
Trench
Ocean crust
Lithosphere
Subduction zone
Volcanic
arc

6. Tectonic Plates

8. Ring of Fire
“ring” around pacific ocean that shows the areas of the greatest volcanic
And earthquake activity in the world. Each dot is a volcanic or earthquake site

9. Summary
Thompson and Turk Page140 table 6.2

10. Plate Tectonic Animations
• http://sideshow.jpl.nasa.gov/post/series.ht
ml
• http://www.iris.edu/hq/programs/education
_and_outreach/animations/14