alluvium

alluvium

CEFR: C1-C2 /al-lu-vi-um/ [ae2.l.uw1.v.iy0.ah0.m]

Definition: A deposit of clay, silt, and sand left by flowing floodwater in a river valley or delta, typically producing fertile soil

Example Sentences:
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.