1. Plate Tectonics
Mountain Building

2. Plate Tectonics
Mountain building is a process in which mountains are formed due to converging or diverging plates.
Meaning that mountains are formed from plates colliding or moving apart.

3. Folded rock layers are produced by compressional forces when two plates collide. This part of the folded mountain shows a syncline.

4. Although the Mid-Atlantic Ridge is mostly an underwater feature, portions of it have enough elevation to extend above sea level. Iceland is part of the Mid-Atlantic Ridge.
Therefore, Iceland was formed by diverging plates.

5. Example of new crust being formed at Iceland.
_____ type volcano on the mid-Atlantic ridge.
Sheild

6. Convergent-Boundary Mountains
The following three slides show mountain types produced when plates move __________.
together

7. Ocean-Ocean Convergence
Volcanic island arc
trench
Basaltic magma
Examples: Aleutian Islands, Phillipines,______
Japan

8. Ocean-Continental Convergence
volcanic mountains
trench
metamorphic rock
Explosive eruptions
Examples: ________, Andes
Cascades

9. Continental-Continental Convergence
folded mountains
metamorphic and sedimentary rock
faults
igneous intrusions
Appalachians
Examples: Himalayas,___________ , million years

10. Divergent-Boundary Mountains
The next three slides show mountains formed at divergent boundaries (plates moving _____), hot spots.
apart

11. Divergent-Boundary Mountain
pillow basalts
intrusive rock
Example:
Mid-Atlantic Ridge

12. Volcanic Hot Spot Mountain
extrusive ingneous rock
Hawaii
Example: ______, Galapagos

13. Fault-Block Mountains
mostly sedimentary rock
Example: __________, Basin and Range
Grand Tetons

14. Mountain Building Review
The Hawaiian Islands formed as a result of a ___________.
The Appalachians are about _________ years old.
The Appalachians are a __________ mountain range.
The Cascades (Mt St Helens, Mt Rainier,…) are a ___________ mountain range with ___________ eruptions.
hot spot
million
folded
volcanic
explosive