2. Key Concept 1.
What Is Seafloor Spreading?
-Seafloor Spreading is the process
by which plate tectonics produces
new oceanic lithosphere.
3. Key Concept 2.
What Is A Subduction Zone?
-A Subduction Zone occurs when one
oceanic plate is forced down into
the mantle beneath a second plate.
4. Oceanic Ridge
A continuous elevated zone on the floor of all
major oceans basins and varying at the crests of
ridges represent divergent plate boundaries
5. Rift Valley
A Rift Valley is a deep faulted structure found along
the axes of divergent plate boundaries; Rift valleys
can develop on the seafloor or on land.
6. Trench
A Trench is a surface feature in the
seafloor produced by the descending plate
during subduction.
7. Continental Volcanic Arc
Continental Volcanic Arcs are mountains formed
in part by volcanic activity caused by the
subduction of oceanic lithosphere beneath a
continent.
8. Volcanic Island Arc
A Volcanic Island Arc is a chain of volcanic
islands generally located a few hundred
kilometers from a trench where subduction of one
oceanic slab beneath another is occurring.
