ESTUARIES occur where rivers empty into the sea. They are transition zones between the fresh water of RIVERS and the salt water of the ocean. Like all transition ecosystems, they are places of tremendous BIODIVERSITY. Nutrients wash down the river to mix with and enrich the near-shore marine environment. Estuaries are among the richest, most productive, most diverse ecosystems on earth. But they are also among the most endangered: just as sediments and nutrients flow downstream, so do...
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