Question

Where does a river floodplain come from?

A. A river erodes the land and deposits sediments as it erodes sideways.
B. Landslides from the river valley walls cause soil and rock to make the floodplain.
C. Flooding along a river removes all the sediment, revealing the floodplain below.
D. As the land gets steeper the river cuts farther and farther down in the soil and rock.

Answer 1

A

Step-by-step explanation:

Answer 2

A

Step-by-step explanation:

Technically a floodplain is created when the river floods carrying sediment with it. When the water evaporates or is absrobed into the ground the sediment which is carried along in the river wtaer is left behind creates a floodplain.