Which of the following summarises the process of slab pull?
1 )
A driving force of plate movement generated at mid-ocean ridges. Newly formed crust cools, becomes denser and so moves away from the centre of the ridge.
A driving force of plate movement generated at a subduction zone as an old, cold dense plate sinks into the mantle beneath.
3 )
Forces generated at conservative plate margins as one plate drags past another.
4 )
Warm convection currents within the mantle act like a conveyor belt, driving and carrying the plates of the lithosphere.
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