Basic Rock Types

Here are ocean-molded jetties, or boulders. They are usually imported from around the world because they are famous for their durability when it comes to preserving land against erosion.

The second two specimens are both known as river rocks. These rocks have a huge philosophical and mythical meaning. 

They are eroded to a smooth shape due to fast-moving river and creek waters. They gather their colours from the water that they dwell beneath and pigments in the geological region.