1. Longshore drift is the movement of sediment along the coastline caused by waves pushing sediment parallel to the shore. 2. At a location where the coastline changes direction, longshore drift can deposit sediment and form a curved spit or hook-shaped landform that extends into the water. 3. Over time, changes in wind direction can cause the spit to develop curved or hooked ends as sediment continues to deposit and the spit grows in a curved shape.