Question

for people in ancient chinese communities, flooding around the yellow and yangtze rivers was a common problem.
but floods had both positive and negative effects for people in ancient china. which of the following was a positive effect of flooding?
floods killed many animals who lived near the river.
after a river flooded, fertile soil was left on the land.
floods destroyed homes located near the river.
many crops were destroyed by the floods.

Explanation:

The question asks for a positive effect of flooding in ancient China. Killing animals, destroying homes, and ruining crops are all harmful, negative impacts. Floodwaters deposit nutrient-rich silt, which creates fertile soil beneficial for agriculture, a positive outcome for farming communities.

Answer:

After a river flooded, fertile soil was left on the land.