Here's a breakdown:
* Crust: The outermost layer of Earth, composed of relatively light, solid rock. There are two types:
* Oceanic crust: Thinner and denser, primarily composed of basalt.
* Continental crust: Thicker and less dense, primarily composed of granite.
* Uppermost mantle: This part of the mantle is solid but behaves like a very viscous fluid over long periods.
Together, the crust and the uppermost mantle make up the lithosphere. The lithosphere is broken into several large plates that move and interact, causing earthquakes, volcanic eruptions, and the formation of mountains.
