Here's a breakdown:

* Sedimentary rocks are formed from the accumulation of sediments (small pieces of other rocks, minerals, and organic matter).

* Deposition is the process where these sediments are laid down in layers.

* Cementation occurs when dissolved minerals in groundwater crystallize between the sediment particles, binding them together to form solid rock.

So, the process you described, where small pieces of other rocks are deposited in layers and cemented together by dissolved mineral material, is the key process in creating sedimentary rocks.