Here's a breakdown:

* Lithosphere: This is the rigid outer layer of Earth, which includes the crust and the uppermost part of the mantle. It's broken into tectonic plates.

* Asthenosphere: This is a semi-solid layer of the upper mantle located below the lithosphere. It's characterized by its plasticity and ability to flow slowly. The asthenosphere is like a very viscous fluid, and it's this flow that allows the tectonic plates to move on top of it.

Think of it like a plate floating on a very thick soup. The plate is the lithosphere, and the soup is the asthenosphere!