Final answer:
Mantle plumes create convection cells in the mantle, contributing to the convective flow.
Step-by-step explanation:
Mantle plumes are thought to play a role in the convective flow in the mantle by creating convection cells. These convection cells are regions of increased temperature that can cause melting of the lithospheric region. With the movement of tectonic plates over these plumes, hotspot-generated volcanoes can be found anywhere in the world.