Question

alluvial plains are created by river ---------

Answer 1

An alluvial plain is a large flat landform that is created from the deposition of sediment or debris over a long period by rivers from the highlands. ... Once the deposited sediments increase, they form alluvial soil. The process of transporting the sediment by water is called fluvial process.

The Mississippi River Alluvial Plain is an alluvial plain created by the Mississippi River on which lie parts of seven U.S. states, from southern Louisiana to southern Illinois (Illinois, Missouri, Kentucky, Tennessee, Arkansas, Mississippi, Louisiana).