Here's why:

* Sandstone is a sedimentary rock made up of sand-sized particles.

* Quartz is a very common mineral found in sand.

* Cementation is the process where dissolved minerals in water crystallize between sand grains, binding them together.

* The layers indicate the rock formed over time, with different sediment layers accumulating on top of each other.

The brown color likely comes from the presence of iron oxides within the rock.

Let me know if you'd like more details about sandstone!