Soil Erosion

Soil erosion: Introduce water erosion that would make coastal land slowly erode away into the ocean. Dirt/sand/crushed materials would obviously erode at a faster rate than lets say rock/slag/limestone/etc. I would suggest that ore deposits shouldn't be able to erode. The ability to turn erosion on/off would be nice for players who don't want to deal with the extra challenge of keeping their shorelines from eroding! The rate at which the coastline erodes could also be sped up for more difficulty, but could be based on true-to-life erosion rates.