Natural disasters in novels can usually be classified according to the damage caused and the range of influence. The following are some common natural disaster levels: 1. Apocalypse: A destructive disaster can cause great damage to a city or region or even destroy an entire civilization. 2. Blood Rain: Similar to the apocalypse but more contagious. It can cause devastating effects on multiple cities or regions in a short period of time. 3 Meteorites: A huge meteorite hitting the Earth can cause large-scale damage and loss of life. Tornado: A strong tornado can destroy an entire city and even cause catastrophic fires or floods. Earthquakes: Earthquakes can cause great damage, especially when they occur in mountainous areas or under the sea. 6 Volcanic Eruption: Volcanic eruptions can cause catastrophic effects including fires, tsunamis, volcanic ash, etc. Virus 7: Some viruses can cause large-scale death and disease such as the ebola virus and the COvid-19 virus. It should be noted that different novels may have different levels of natural disasters, and these levels are not necessarily fixed.