It's not that Earth's crust moves "often" in a way we typically think of, like a car moving down the road. Instead, the movement is constant and slow, happening all the time at a rate of just a few centimeters per year.

Here's a breakdown:

* Plate Tectonics: The Earth's crust is broken into large pieces called tectonic plates. These plates are constantly moving, driven by heat from the Earth's core.

* Types of Movement: The plates can move apart (divergent), collide (convergent), or slide past each other (transform).

* Speed: The rate of movement varies depending on the specific plate boundary, but it's generally very slow, usually measured in centimeters per year.

So, while it's not something we can "feel" on a daily basis, the Earth's crust is constantly moving. This movement is responsible for many geological phenomena, including earthquakes, volcanic eruptions, and the formation of mountains.