Final answer:
Weathering and erosion begin the process of forming sediments, which can then form sedimentary rocks.
Step-by-step explanation:
In the rock cycle, weathering and erosion start the process of breaking down pre-existing rocks into smaller particles. These particles, known as sediments, accumulate through deposition by wind, water, or ice in new locations, where they can eventually become cemented together to form sedimentary rocks. Sedimentary rocks are classified into categories like clastic, chemical, and organic, based on the way they form and their composition.