# Add Sand To further polish our terrain, we now move on to [Simulation Layers](https://docs.world-creator.com/reference/terrain/simulation-layers). Simulation Layers provide high quality physical simulations such as [Sand](https://docs.world-creator.com/reference/terrain/simulation-layers/sand), [Fluid](https://docs.world-creator.com/reference/terrain/simulation-layers/fluid), [Snow ](https://docs.world-creator.com/reference/terrain/simulation-layers/snow)or [Debris ](https://docs.world-creator.com/reference/terrain/simulation-layers/debris)that work with simulated material on top of the filter stack. Since we want to create a desert canyon, we will use the sand simulation first. After adding the Sand layer, click **Edit** and mask out the area where the sand will spawn. By default, each simulation layer comes with its own paintable mask.

To texture our sand we create a new material, give it a sand like colour and drag the sand simulation layer into its distribution stack. This creates a [simulation layer distribution](https://docs.world-creator.com/reference/terrain/distributions/layer/simulation) that references the sand layer.

To further enhance the scene we then add a second sand simulation using a darker material. This time we do not mask it, instead we reduce the **Spawn Amount,** which then results in a nice global fade effect.