Occurs at destructive plate boundaries
Oceanic plate is thin & dense therefore it is subducted underneath the lighter & thicker continental plate
Weight of oceanic plate moving down causes more oceanic plate to move down
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What is Ridge push?
Occur at constructive plate boundaries
Plates are pushed apart
Happens due to magma rising up from the mantle as 2 plates diverge
The magma reaches the surface it cools, thickens & pushes previously erupted material away from the the plate margin
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What to do in exam questions
- If asked to explain a plate boundary/margin, use all 3 explanations
- If asked a 15 marker put slab pull & convection currents ahead of ridge push
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