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Estuaries are used as natural harbors for shipping and they account for 70% of commercial fishing in the U.S.A .

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The heavier salt water enters as a wedge in the bottom of the estuary as the lighter fresh water flows over the top of the salt water.

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This is similar to the slightly stratified variant of estuaries, but it occurs on the top of the water in Fjords.

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The salt water comes up and mixes with the fresh water and goes back out to sea. This means that the deeper and further towards the sea you go, the greater the salinity of the water.

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The amount of salinity in the water (vertically constant) increases from the land to the sea.

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The salt water flows in to the estuary and the freshwater flows in in four different ways, vertically mixed, slightly stratified, highly stratified, and salt wedge

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Estuaries are formed where rivers flow into the ocean.

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Estuaries are aquatic ecosystems that have a mix of salt and fresh water.