Answer:
Slab pull suggests that cold oceanic lithosphere sink to great depths.
Explanation:
Slab pull is one of the two primary driving forces of plate motion.
When lithospheric plates cool and become denser as they move away from midocean ridges, they eventually become denser than the underlying hot mantle, and the dense lithosphere "sinks like a rock" into the mantle under its own weight. This motion pulls the rest of the plate with it down into the mantle by gravity.
