Question

______ are formed beside low-gradient rivers when floods occur and sediments build up along the channels. These features become barriers to water returning to the river from the floodplain.

Answer 1

Natural levees are formed beside low-gradient rivers when floods occur and sediments build up along the channels. Read more on natural levees.

What are natural levees?

Natural levees are embankments formed naturally after a river floods and recedes. During flooding, a friction with the floodplain can cause a decrease in the velocity of the river and consequently causing material deposit that the flood water is carrying.

Therefore, the answer to the above is natural levees.

learn more about natural levees: https://brainly.com/question/1104575