What layer beneath the lithosphere allows the rigid tectonic plates to glide across it?

Answer

The asthenosphere

The asthenosphere is a layer of the mantle that is hotter and more ductile, meaning it can slowly flow, enabling the rigid tectonic plates to float or glide upon it.

What layer beneath the lithosphere allows the rigid tectonic plates to glide across it?
GeologyEarthsurfaceTectonicplate