Transcript Seafloor Spreading

Seafloor Spreading
“The Crust’s Giant Conveyor Belt”
Harry Hammond Hess and
The USS Cape Johnson
Sonar mapped the ocean floor.
The Mid-Ocean Ridge was discovered.
The mid ocean ridge goes around the
world (just like a baseball seam).
Mid-Ocean Ridge
The age of rock has a pattern.
The magnetic polarity of the
rock has the same pattern.
Please add the following labels to your model:
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Mid Ocean Ridge
Rift Valley
Convergent Plate Boundary (2) –Plates are coming together
Divergent Plate Boundary –Plates are drifting apart
Subduction Zone (2)
Oceanic Plate (2)
Oceanic Trench (2)
Indicate where the newest oceanic floor can be found.
Indicate where the oldest oceanic floor can be found.
Divergent Plate Boundaries
• Divergent Plate
Boundaries are
where the
plates are
moving
(Drifting)
apart.
Convergent Plate Boundaries
• Convergent
Plate
Boundaries are
where the
plates are
colliding
(coming
together).
Iceland
Rift Valley