Here's why:

* Sedimentary rocks are formed from the accumulation and cementation of sediments. These sediments can come from various sources, including:

* Weathering: The breakdown of existing rocks into smaller pieces.

* Erosion: The transportation of weathered material by wind, water, or ice.

* Deposition: The settling and accumulation of transported sediments.

* Compaction: The weight of overlying sediments pressing down on the lower layers, squeezing out water and air.

* Cementation: Dissolved minerals in groundwater precipitate between sediment grains, binding them together.

* Crystallization is the process of forming crystals from a solution or melt. This is a key process in the formation of igneous rocks (formed from cooling magma or lava) and some metamorphic rocks, but not sedimentary rocks.

Let me know if you have any other questions!