What harm have natural disasters brought to mankind?

For example, when a flood breaks out, we see not only that the flood is coming, but that it is too late to wait for it to recede. After the flood, the most important thing for us is to prevent the occurrence of diseases. There are no plants in our land, many people's houses are gone, and many people's relatives and friends have nothing in the future and don't know what they are thinking. Many people may say it's acceptable, but I don't know my relatives and friends who will follow me away that day, so I won't say much.

The earthquake broke out, like this 5. 12, we all know a lot, family friendship, the hearts of the victims.

5. 12 before, many people witnessed it and learned that everyone around them had left. Some people couldn't bear it anymore and followed. Because of 5. 12, volcanic eruption (which will bring an earthquake) and so on, we don't know when and where the earthquake may happen again.