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( Destructive, Constructive ) margins occur where two plates are moving towards each other. When a ( continental, destructive ) plate meets an oceanic plate, the oceanic plate is forced down into the ( mantle, crust ) and destroyed. When two ( continental, oceanic ) plates meet the plates collide, fold and are forced ( upwards., downwards. )
( Constructive, Conservative ) margins occur when plates are moving away from each other. This causes ( magma, lava ) to rise and cool, filling in the gap and creating new ( crust, mantle ).
( Conservative, Constructive ) margins occur when plates move ( sideways, upwards ) past each other, or move in the same direction but at different ( speeds, pressures ). Crust is not ( destroyed or created, destroyed or moved, damaged or moved ).