Question

how are floodplains formed​

Answer 1

Flood plains are formed when a meander erodes side ways as it travels down stream. when a river breaks it's banks, it leaves behind layers of alluvium (silt) These are gradually build up to create the floor of the plain.

Answer 2

Answer:

Floodplains. A floodplain is an area of land which is covered in water when a river bursts its banks. Floodplains form due to both erosion and deposition. Erosion removes any interlocking spurs , creating a wide, flat area on either side of the river.