What is a floodplain?

A) A broad strip of land built up by sedimentation on either side of a stream channel. Covered with water during a flood.
B) A body of sediment deposited at the mouth of a stream when the stream's velocity decreases.
C) A ridge of sediment, usually sand or gravel, deposited in the middle or along the banks of a stream.
D) Step-like landforms found above a stream.

Floodplain

An area of relatively smooth land adjacent to a stream channel that is intermittently flooded when the stream overflows its banks.

Sedimentation

The process by which material is deposited by wind, water, or ice, often resulting in layers of sediment that can eventually form sedimentary rocks.

Stream Channel

A stream channel is the physical confinement of a river or stream, composed of a bed and banks, which directs the flow of water.