Here's why:

* The asthenosphere is a layer within the Earth's mantle. It lies beneath the lithosphere, which includes the crust.

* The asthenosphere is characterized by its semi-molten, plastic-like state. This allows tectonic plates to move and shift on top of it.

* The crust is the outermost solid layer of Earth. It is relatively thin compared to the mantle and is divided into oceanic and continental crust.

Think of it like this: Imagine a hard-boiled egg. The shell is like the crust, the white is like the lithosphere, and the yolk is like the asthenosphere.