Hello i don’t understand how slab-pull force works. anyone able to explain it?(from tectonic hazards)

The theory is that because the oceanic plate is denser than the hotter mantle beneath it, this contrast in density causes the plate to sink into the mantle. The process of a tectonic plate descending into the mantle is termed subduction. Slab pull occurs when an oceanic plate subducts into the underlying mantle.

Canada and