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Vocabulary about rivers
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a low flat area of land where a river divides into smaller rivers and flows into the sea
delta
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lakes that contain sea water
lagoons
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areas of soft, wet land
marshes
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the wide parts of rivers where they go into the sea
estuaries
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the regular rise and fall of the level of the sea
tide
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the place where a river starts
source
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a layer of mud, sand, stones etc. that forms at the bottom of a river
sediment
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strong walls built across a river to stop the water
dams
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