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alluvium

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definition: 
A deposit of clay, silt, and sand left by flowing floodwater in a river valley or delta, typically producing fertile soil
sentence: 
In the east, which is lower and flatter, river gravels and alluvium from the North Sea have produced dark, rich soils. Above these sedimentary rocks is a sequence of interbedded alluvial floodplain deposits and palaeosols.
difficulty: 
hard
toefl frequency: 
1
toefl classification: 
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