Movements of the Earth's crust, also known as plate tectonics, primarily take place along plate boundaries. These boundaries are the zones where the Earth's lithosphere (the rigid outer layer composed of the crust and upper mantle) is broken into large pieces called tectonic plates.

There are three main types of plate boundaries:

* Divergent boundaries: Where plates move apart, creating new crust. This process, known as seafloor spreading, occurs mainly at mid-ocean ridges and results in the formation of new oceanic crust.

* Convergent boundaries: Where plates collide, resulting in either one plate sliding beneath the other (subduction) or in the collision of two continental plates. Subduction zones are often associated with volcanic arcs and deep-sea trenches, while collisions between continental plates can lead to the formation of mountain ranges.

* Transform boundaries: Where plates slide horizontally past each other. These boundaries are often associated with earthquakes.

While most crustal movements occur along these boundaries, intraplate deformation can also occur within plates, leading to localized uplift, subsidence, or faulting. This type of deformation is generally less common and less dramatic than movement along plate boundaries.

Therefore, the answer to your question is: movements of the Earth's crust typically take place along plate boundaries, but can also occur within the plates themselves.