The final stage in the life of a river is its joining with the sea. By now the river is traveling smoothly and carrying a lot of sand and clay. Merging with the sea slows the water flow even more, and the sediment drops out. This often leads to the formation of a delta, a broad, triangular river mouth with many sand bars and water channels. The delta becomes an estuary, an area with sheltered waters and a constant stream of nutrients from the land.
Estuaries are important nurseries for the young of aquatic animals.
Elizabeth Anne Viau and her licensors. All rights reserved. This material may be used by individuals for instructional purposes but not sold.