Here's why:

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

* Sedimentary indicates that the rock was formed from sediments, which are loose materials like sand, gravel, or clay.

The mineral that cements the fragments together is called a cement. Common cements include calcite, quartz, and iron oxides.

Some examples of clastic sedimentary rocks include:

* Sandstone: Composed of sand-sized grains cemented together.

* Conglomerate: Composed of gravel-sized fragments cemented together.

* Breccia: Similar to conglomerate, but the fragments are angular instead of rounded.

* Shale: Composed of very fine clay-sized particles cemented together.