Yes, that's exactly right! Sandstone is a sedimentary rock, meaning it's formed from the accumulation and cementation of smaller pieces of other rocks.

Here's the breakdown:

* Sand grains: The tiny bits of rock that make up sandstone are called sand grains. These grains are typically made of minerals like quartz, feldspar, and mica.

* Cementation: Over time, the sand grains are compacted together by pressure from overlying sediments. Minerals dissolved in groundwater seep into the spaces between the grains and crystallize, acting like a glue to bind the grains together. This process is called cementation.

So, sandstone is essentially a collection of tiny rock fragments that have been glued together by natural processes.