Submitted by admin on Mon, 04/14/2014 - 23:29
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
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