How do the flowing layers of the Earth interact?
They interact by the core transferring energy by conduction to the upper mantle
assisting in the softening of the rock layer which leads to convection.
They interact by the core transferring energy by convection to the upper mantle
assisting in the softening of the rock layer which leads to conduction.
They interact by the core transferring energy by precipitation to the upper mantle
assisting in the softening of the rock layer which leads to evaporation.
They interact by the upper mantle transferring energy by conduction to the core
assisting in the softening of the rock layer which leads to radiation.

They interact by the upper mantle transferring energy by conduction to the core assisting in the softening of the rock layer which leads to radiation.

Explanation:

Convection currents coming from the core and mantel are believed to the main cause of the interaction. As these currents travel up and down the curst and mantle boundary and this creates the plates to move freely forming a conveyor belt.

The core of the earth creates this convective current to rise up due to the heat and pressure. The hot molten rocks in the mantle eventually cool and the cycle of rising and sinking takes place.