The basic types of landslide movement Flow.This is the most destructive and turbulent form of landslide.Flows have a high water content which causes the slope material to lose cohesion, turning it into a slurry.They are channelled by the landscape and move rapidly. Source area Main track USGS The basic types of landslide movement  Flow. This is the most destructive and turbulent form of landslide. Flows have a high water content which causes the slope material to lose cohesion, turning it into a slurry. They are channelled by the landscape and move rapidly