Locate and describe the mid-ocean ridge system and deep-ocean trenches. Describe the relation between earthquakes and plate boundaries. Describe the magnetic polarity reversals that have taken place on Earth in the last four million.

The Dynamic Ocean Floor
List and explain the lines of evidence that sup­port the theory of plate tectonics.
Locate and describe the mid-ocean ridge system and deep-ocean trenches.
Describe the relation between earthquakes and plate boundaries.
Describe the magnetic polarity reversals that have taken place on Earth in the last four million.
Determine the rate of seafloor spreading that oc­curs along a mid-ocean ridge by using paleomag­netic evidence.
Use the rate of seafloor spreading for an ocean basin to determine its age.
Describe the three types of plate boundaries and the motion of the plates that occurs along each.

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