Constructive plate margin
- Plates move apart
- The gap is filled by magma from the mantle
- Forms shield volcanoes which can form islands
Example: Mid-atlantic ridge- North American plate and Eurasion plate
Conservative plate margin
- Plates move along side each other
- They move at different speeds in the same direction
- Pressure builds up until one plate jerks past the other causing an earthquake
Example: San Adreas- North American plate and pacific plate.
- Conservative plate- Fold mountains and earthquakes
- Constructive plate- Volcanic island
- Destructive plate- Fold mountains and earthquakes
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