Grinding away of solid rock surfaces by particles carried by water, ice, and wind. It is generally held to be the most significant form of erosion in rivers. As the eroding particles are carried along they are eroded themselves (becoming rounder and smaller) due to the process of attrition.
The stars symbolize hope and equality between the ten parishes. Green reflects the island's lush vegetation. The red disc has socialist connotations. Effective date: 3 November 1990.