Estimates vary, but sedimentary rocks make up roughly 5% of the Earth's crust by volume. The majority of Earth's crust is made up of igneous and metamorphic rocks, which are found much deeper within the Earth.
Here's why this might seem counterintuitive:
* Weathering and Erosion: Sedimentary rocks form from the breakdown of other rocks through weathering and erosion, which are processes happening at the Earth's surface. This makes them the most visible type of rock.
* Plate Tectonics: Igneous and metamorphic rocks are formed deep within the Earth and are constantly being recycled by tectonic processes. This means that although they make up the majority of the crust, they are less visible at the surface.
So, while sedimentary rocks may be abundant on the surface, they represent a relatively small percentage of the Earth's overall rock composition.
