Here's why:

* Sedimentary rocks form from the accumulation and cementation of sediments. This process involves several steps:

* Weathering: Breaking down existing rocks into smaller pieces (sediments).

* Erosion: Transporting these sediments by wind, water, or ice.

* Deposition: The sediments settle down in a new location.

* Compaction: The weight of overlying sediments presses the layers together, squeezing out water.

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

* Crystallization is the process of forming crystals from a solution or melt. This is the primary way igneous and metamorphic rocks form, not sedimentary rocks.

Let me know if you have any other questions!