1. Continental Rift Valley
Definition = A lowlying area formed when continental plates are moving away from each other.
Boundary = Divergent
Example = East African Rift System

2. Continental Rift Valley

3. Mid- Ocean Ridge
Definition = an underwater mountain range
Boundary = Divergent
Example = Mid-Atlantic Ridge

4. Mid – Ocean Ridge

5. Sea-Floor Spreading
Definition = new oceanic crust material is created as plates move away from each other
Boundary = Divergent
Example = Mid-Atlantic Ridge

7. Volcanic and Island Arcs
Definition = A chain of volcanoes parallel to a mountain belt that are shaped like an arc when viewed from above. They are formed when one plate sinks below another plate.
Boundary = Convergent
Example = The Aleutian Islands

9. Deep Sea (Ocean) Trench
Definition = a long narrow depression in the ocean floor that is formed when an oceanic plate sinks below another plate
Boundary = Congergent
Example = The Mariana Trench is the deepest part of the ocean

12. Mountain Range Definition = a group or chain of mountains
Boundary = Convergent OR Divergent
Example = Himalayas (convergent)

15. Subduction Zone
Definition = the area where one plate sinks below another plate
Boundary = Convergent
Example =
Mount Ranier

17. Earthquakes
Definition = sudden release of energy in the Earth's crust that produces seismic waves
Boundary = Convergent, Divergent, AND Transform!
Example: Haiti