Here's why:

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

* Sedimentary indicates that the rock was formed from sediments that were transported and deposited.

These fragments can be anything from tiny grains of sand to large boulders. They are cemented together by minerals that precipitate from water.

Here are some examples of clastic sedimentary rocks:

* Sandstone: Composed of sand-sized grains

* Conglomerate: Composed of gravel-sized fragments

* Breccia: Similar to conglomerate, but the fragments are angular

* Shale: Composed of very fine-grained clay particles

Let me know if you have any other questions about sedimentary rocks!