Question

what is Delta fertile
​

Answer 1

Delta's are so fertile because sand from different lands brought by water. Delta is a landform that forms from deposition of sediment carried by a river as the flow leaves it's mouth and enters slower-moving or stagnant water.

Answer 2

The Mississippi delta is the area between the branches the river has and the sea which they join. So is the Nile delta, the area between the branches of the river and the sea which they join. A delta is very fertile and an area flourishing with civilization.