What has the greatest direct influence on movement of the lithosphere?

The greatest direct influence on the movement of the lithosphere is the convection currents in the Earth's mantle. These currents are driven by the heat from the Earth's core, causing the semi-fluid asthenosphere beneath the rigid lithosphere to flow. This movement leads to the shifting of tectonic plates, resulting in geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges. Additionally, the interactions at plate boundaries, including collisions, separations, and sliding past one another, significantly impact lithospheric movement.