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dark, rich and soft
Silt and rich soil for farming
delta
An alluvial plain, sometimes also referred to as a fluvial plain.
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.
The Delta formed by the soil the river depositsas it flows into the sea and it becomes a wet area just like a swamp.
The river delta, named for the shape of the greek letter delta (Δ)
The area of fertile soil at the mouth of a river is called river delta.
the mound builders chose to settle in areas east of the Mississippi River because it was rich in forests, fertile soil, lakes,and rivers.
A delta
The area of fertile soil at the mouth of a river is called river delta.
A plain is a level area of land. A delta is land created by a river that deposits soil. The term "delta" usually impies the triangular shape of land at the opening of a river into a sea or lake. However a delta can be formed by flooding of large rivers. Just below Memphis, there is some flat land that has deep, fertile top soil that has been created by thousands of years of flooding by the Mississippi River. These plains are deltas.