* Sedimentary rocks are formed from the accumulation and cementation of sediments.

* Sediments can be:

* Rock fragments: These are pieces of pre-existing rocks (igneous, sedimentary, or metamorphic) that have been broken down by weathering and erosion.

* Mineral fragments: These are individual mineral grains that have been released from existing rocks.

* Organic matter: This includes the remains of plants and animals.

So, to summarize:

* Sedimentary rocks are formed from the broken down pieces of other rocks (igneous, sedimentary, or metamorphic) and minerals, as well as organic material.

* The process of breaking down these materials is called weathering and erosion.

* The fragments are then transported and deposited, eventually becoming cemented together to form new sedimentary rocks.

Let me know if you have any more questions!