What happens because the lithosphere floats on the asthenosphere?

The lithosphere floats on the more ductile asthenosphere due to differences in density and viscosity, allowing for the movement of tectonic plates. This buoyancy enables the lithosphere to break into plates that can shift and interact at their boundaries, leading to geological phenomena such as earthquakes, volcanic activity, and mountain building. The dynamic nature of these interactions is driven by convection currents in the asthenosphere, which facilitate plate tectonics and shape the Earth's surface over time.