Here's why:
* Formation: Sedimentary rocks are formed from the accumulation and cementation of sediments, which are fragments of other rocks, minerals, or organic matter. These sediments are weathered and eroded from existing rocks, transported by wind, water, or ice, and deposited in layers.
* Surface Exposure: Because they are formed from materials derived from other rocks, sedimentary rocks are typically found at the Earth's surface, where they are exposed to weathering and erosion.
* Abundance: Sedimentary rocks cover about 75% of the Earth's surface, making them the most abundant type of rock.
While igneous and metamorphic rocks are also present at the surface, they are typically found in areas where tectonic activity is high, such as volcanic regions or mountain ranges.
