Linked from
The 11 pages that link to Core–mantle boundary, each with the reason it gives.
Mantle convectionRelated: The hot lower boundary from which thermal buoyancy in the mantle arises.
Earth's coreBroader topic: Heat crossing this interface helps drive convection in the outer core.
Lower mantleRelated: It defines the lower mantle’s deepest boundary.
Iron planetRelated: Iron planets have a large core relative to this boundary's mantle side.