Here's why:

* Clastic refers to the fact that these rocks are made up of fragments (clasts) of other rocks.

* Sedimentary refers to the fact that these rocks are formed from sediment, which is material that has been transported and deposited by wind, water, or ice.

Here are some examples of clastic sedimentary rocks:

* Sandstone: Formed from sand-sized fragments.

* Conglomerate: Formed from gravel-sized fragments.

* Shale: Formed from clay-sized fragments.

* Breccia: Similar to conglomerate, but the fragments are angular, indicating little transport.

Let me know if you have any more questions about rocks!