The movement of the lithosphere, broken into tectonic plates, occurs atop which semi-fluid layer?

Answer

The asthenosphere

Tectonic plates, which form the rigid outer layer (lithosphere), move slowly atop the semi-fluid layer beneath them known as the asthenosphere.

The movement of the lithosphere, broken into tectonic plates, occurs atop which semi-fluid layer?

#Videos

The Earth Is Wobbling: The Precession of the Equinoxes - YouTube

GeologyEarthmovementshiftTremor