Here's why:

* Sedimentation: Sedimentary rocks are formed from the accumulation of sediments, like sand, mud, and organic matter.

* Basins as Collectors: Basins, which are low-lying areas on the Earth's surface, act as natural traps for sediments. Rivers carry sediments from higher elevations and deposit them in these basins.

* Types of Basins: Basins can be formed in various ways, including:

* Tectonic Basins: These are formed by the movement of tectonic plates, creating depressions in the Earth's crust.

* Erosional Basins: These form due to the erosion of land by wind and water.

* Impact Basins: These are created by the impact of asteroids or other celestial bodies.

Examples of Sedimentary Basins:

* The Mississippi River Delta: A major sedimentary basin formed by the deposition of sediment from the Mississippi River.

* The Appalachian Basin: A large sedimentary basin in eastern North America, containing vast deposits of coal, natural gas, and oil.

* The Great Basin (Western U.S.): This region contains numerous sedimentary basins, formed by tectonic activity and erosion.

Other Locations:

While basins are the primary locations for sedimentary rock formation, they can also be found in other places, including:

* Coastal areas: Waves and currents deposit sediment along shorelines.

* Desert environments: Wind can deposit sand and other sediments in deserts, forming dunes and other features.

* Glaciated areas: Glaciers carve out valleys and deposit sediments as they retreat.

Overall, sedimentary rocks are abundant on continents, particularly in the low-lying areas of basins, where sediments accumulate and are buried, undergoing the processes of lithification to form rock.