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Wetlands- partially submerged land year round that include estuaries, swamps, marshes, etc 

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Wetlands- partially submerged land year round that include estuaries, swamps, marshes, etc 

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Estuary- rivers meeting an islet of the sea 

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Estuary- rivers meeting an islet of the sea 

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Watershed- area of land covered by a river and all its tributaries 

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Watershed- area of land covered by a river and all its tributaries 

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Tributary- smaller stream that joins a bigger stream 

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Tributary- smaller stream that joins a bigger stream 

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Tributary - Video Learning - WizScience.com

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A "tributary" or "affluent" is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river serve to drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean.