Here's a breakdown:
* Crust: This is the outermost, rocky layer of the Earth. It's relatively thin and is divided into oceanic crust (thinner and denser) and continental crust (thicker and less dense).
* Upper mantle: This is the layer beneath the crust. The uppermost part of the mantle, along with the crust, makes up the lithosphere. This part of the mantle is relatively rigid and brittle.
It's important to note that the entire upper mantle is not part of the lithosphere. Below the rigid lithosphere lies the asthenosphere, which is a softer, partially molten layer of the upper mantle. The lithosphere "floats" on the asthenosphere.
