- Flood is the water that overflows the river bank
- A riverbank is made of soil
- Hence, when it floods, water will overflow the soil on the river bank

- When it floods, water will overflow the soil on the river bank
- A flood is a kind of moving water
- Soil erosion is when moving water moves soil from fields / environments
- Hence, a flood overflowing the riverbank will cause soil erosion

Hence, a flood overflowing the riverbank will cause soil erosion
Which would cause the most soil to erode from a river bank in just a few days?
- Flood is the water that overflows the river bank 
- A riverbank is made of soil 
- A flood is a kind of moving water 
- Soil erosion is when moving water moves soil from fields / environments