The lithosphere is the outermost layer of the Earth, composed of the crust and the uppermost part of the mantle. It's broken into several large and small plates that move slowly over the asthenosphere, a hotter and more fluid layer of the upper mantle.
Here's why the lithosphere is important for tectonic plates:
* Rigidity: The lithosphere is strong and rigid, allowing it to move as a single unit.
* Density: It's denser than the asthenosphere, allowing it to "float" on top.
* Heat Convection: Convection currents in the asthenosphere drive the movement of the lithospheric plates.
The movement of these plates leads to various geological phenomena, including earthquakes, volcanic eruptions, mountain formation, and the creation of new ocean floor.
