Here's why:

* Earth's Crust: The Earth's outermost layer, the crust, is divided into large, moving pieces called tectonic plates.

* Plate Boundaries: These plates constantly move and interact along their boundaries.

* Types of Movement: At these boundaries, plates can collide (converge), pull apart (diverge), or slide past each other (transform).

* Energy Release: When these plates move, they sometimes get stuck. The built-up pressure and energy is eventually released in a sudden burst, creating an earthquake.

Let me know if you want to know more about the different types of plate boundaries and how they cause earthquakes!