Question

1. Floodplains are the flat land near a river that is covered with water when the river rises following a storm. They can control flooding when the waters of a narrow river rise rapidly. As soon as the river's water has exceeded its banks and enters a floodplain, the water spreads out over a wide area and slows down. There, the floodplain holds the water, allowing it to be slowly released into the river system and into underground bodies of water. Floodplains also help clean rivers and streams. They keep the water long enough for sediment (small particles of dust, rock, and organic matter) to settle into the earth under the floodplain. This keeps the sediment out of the river or stream. what is topic sentence​

Answer 1

Answer:

it is a about flood plain

Answer 2

Answer:

When water rises rapidly it causes flood plain

Explanation:

When water rises is the main idea following by the controlled idea which is

causing flood plain.