Continental Rift Valley
Definition = A lowlying area formed
when continental plates are
moving away from each other.
 Boundary = Divergent
 Example = East African Rift
System

Continental Rift Valley
Mid- Ocean Ridge
 Definition = an underwater mountain
range
 Boundary = Divergent
 Example = Mid-Atlantic Ridge
Mid – Ocean Ridge
Sea-Floor Spreading
Definition = new oceanic crust
material is created as plates move
away from each other
 Boundary = Divergent
 Example = Mid-Atlantic Ridge

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
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

Mountain Range

Definition = a group or chain of mountains

Boundary = Convergent OR Divergent

Example = Himalayas (convergent)
Subduction Zone
Definition = the area where one
plate sinks below another plate
 Boundary = Convergent
 Example =
Mount Ranier

Earthquakes
Definition = sudden release of
energy in the Earth's crust that
produces seismic waves
 Boundary = Convergent,
Divergent, AND Transform!
 Example: Haiti
