When convection take place in the mantlewhat does cool rock material sink and warm rock rises?

Convection in the mantle occurs due to temperature differences within the Earth's interior. As rock material heats up, it becomes less dense and rises towards the surface. Conversely, cooler rock material, which is denser, sinks back down towards the core. This continuous cycle of rising and sinking creates a convection current that drives the movement of tectonic plates.