Sedimentary rocks are the most common type of rock on the Earth's surface because they are constantly being formed through the process of sedimentation. Weathering and erosion break down larger rocks into smaller particles, which are then transported by wind, water, or ice to new locations. These particles can accumulate in large deposits, and over time, the weight of the overlying material compresses and cements the particles together to form sedimentary rock.

In addition, sedimentary rocks are more resistant to weathering and erosion than other types of rocks. This is because they are typically composed of smaller particles that are more tightly packed together, making them less vulnerable to breakdown. As a result, sedimentary rocks are able to remain on the Earth's surface for longer periods of time.

Some examples of common sedimentary rocks include sandstone, limestone, and shale. Sandstone is formed from the accumulation of sand particles, limestone is formed from the accumulation of calcium carbonate, and shale is formed from the accumulation of mud and silt.