 will sort of slide over the mantle. So the earth consists of the, you know, the crust, the outer crust, and then that rests on the mantle. And the mantle is semi-liquid, so there's some friction, but there's also some movement over it. You know, plate tectonics is an example of that. And then, you know, you go deeper and there's the core, the inner and outer core that generate the geomagnetic field. And so...