Question

which statement explains how convection currents affect the movement of plates?
gravity pulls one edge of a plate down into the mantle, which causes the rest of the plate to move as well.
heat from earths interior causes lithospheric plates to collide at convergent plate boundaries, causing volcanoes
heat from earths interior causes currents of hot rising magma and cooler sinking magma to flow, moving the crust
along with them.
as convection currents drift across the oceans, they bring the pieces of earths crust with them as the
supercontinent breaks apart.

Explanation:

Convection currents in Earth's mantle are driven by heat from the interior. Hot magma rises (less dense), cools (becomes denser), and sinks. This circular motion (convection) exerts force on the overlying crust (lithospheric plates), making them move. The option "Heat from Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the crust along with them" directly describes this convection - driven plate movement mechanism. The other options either focus on incorrect causes (like gravity pulling plates down in one option which is not the main driver of plate movement via convection) or describe consequences (such as plate collisions causing volcanoes) rather than how convection currents affect plate movement.

Answer:

Heat from Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the crust along with them.