The term that best describes the rocky outer layer of the Earth is crust.

Here's why:

* Crust: The outermost layer of the Earth, composed of relatively light, solid rock. It's divided into oceanic crust (thinner and denser) and continental crust (thicker and less dense).

* Mantle: The layer beneath the crust, made up of hot, dense rock that behaves like a very viscous fluid over long periods.

* Core: The Earth's innermost layer, consisting of a solid inner core and a liquid outer core, both primarily composed of iron and nickel.

Let me know if you have any more questions about the Earth's structure!