Here's why:
* Plate Tectonics: The Earth's crust is broken into large pieces called tectonic plates. These plates are constantly moving, colliding, and separating.
* Types of Crust: There are two main types of crust:
* Continental Crust: Thicker and less dense, made mostly of granite.
* Oceanic Crust: Thinner and denser, made mostly of basalt.
* Geological Activity: The movement of these plates is responsible for earthquakes, volcanoes, mountain ranges, and the formation of new ocean floor.
So, instead of one big slab, the Earth's crust is a complex mosaic of moving plates.
