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Land formed by silt deposited by a river is called a delta.
silt
a delta is an area near a river's mouth where the water deposits fine soil called silt
My alluvial island is formed primarily from silt. The barrier of silt is being washed away from the delta!
because it just is
The town was built on the delta that was created by years of silt build-up.
Silt is carried downriver on the fast currents until it reaches the slow to nonmoving waters, where the silt forms a delta, which collects more silt.
The land formed by deposited soil at the mouth of a river is called a delta (named for the Greek letter, which is similarly triangular in shape).The most well known are the Ganges River Delta, India, the Nile River Delta, Egypt, and the largest is the Amazon River Delta, Brazil.
A delta forms the the mouth of a river that is carrying a silt burden. Probably named after the Greek capital letter Delta.
It is called SILT.
A delta.
delta