Estuaries
An estuary is a very special place where fresh water and salt water come together. Estuaries are found on the coast where fresh water like a river or a bay has access to the ocean. A good example of an estuary is a salt marsh that can be found close to the coast. Another example is when a river feeds directly into the ocean. The largest estuary in the United States is the Chesapeake Bay estuary.The mixing of fresh and salt water creates a different environment, but estuaries are still home to a lot of plants, animals and bacteria! When looking at estuaries, scientists quickly realized that these areas were extremely nutrient-rich because of sediment deposit of rivers, creeks or streams feeding into the salt water environment.
Unfortunately, estuaries haven't always been seen as valuable. In the past, they were seen as worthless and were even used as dumps! In 1972, Congress created the National Estuarine Research Reserve System (NERRS) to protect the estuaries around the U.S.
Related links:
Map of the NERRS sponsored sites
A fun activity dealing with the density of salt water versus fresh water
Last modified June 1, 2010 by Lisa Gardiner.