What are the common natural disasters?

There are many kinds of natural disasters in China, including floods, droughts, meteorological disasters such as typhoons, hail, snowstorms and sandstorms, volcanic and earthquake disasters, geological disasters such as mountain collapses, landslides and mudslides, marine disasters such as storm surges and tsunamis, forest and grassland fires and major biological disasters. Natural disasters are abnormal events in the evolution of geographical environment, but they have become one of the most important natural factors that hinder the development of human society.

Natural disaster system is a variation system on the earth's surface, which is composed of disaster-prone environment, disaster-causing factors and disaster-bearing bodies. The disaster situation is the result of the interaction between subsystems in this system. "Natural disaster" is an abnormal phenomenon in the nature on which human beings depend, which has done harm to human society.

Among them are earthquakes, volcanic eruptions, mudslides, tsunamis, typhoons, tornadoes, floods and other sudden disasters; There are also gradual disasters such as land subsidence, land subsidence, land desertification, drought and coastline change, which can only appear gradually in a long period of time; There are also environmental disasters caused by human activities such as ozone layer change, water pollution, soil erosion and acid rain. There is a complex relationship between these natural disasters and environmental damage. It has become the common theme of the international community to scientifically understand the occurrence and development of these disasters and minimize their harm.

Natural disasters refer to casualties, property losses, social instability, resource destruction and other phenomena or a series of events caused by natural abnormal changes. Its formation must meet two conditions: first, there must be natural variation as an inducement, and second, there must be damage to people, property and resources as the object of disaster.

Extended data:

Main impacts of natural disasters:

1, disasters will bring substantial trauma and mental disorders;

2. Most of the pain disappears within one or two years after the disaster, and people can adjust themselves;

3. Chronic mental disorders caused by disasters are very rare;

4. The overall impact of some disasters may be positive, because it may increase social cohesion;

5. Disasters have disrupted organizations, families and personal lives.

Natural disasters can lead to stress, anxiety, depression and other emotional and perceptual problems. The time of the impact and why some people can't adapt as soon as possible are still unknown. After floods, tornadoes, hurricanes and other natural disasters, the victims will show emotional problems such as evil thoughts, anxiety and depression, which will last for one year.

The persistent influence of an extreme disaster is called post-traumatic stress disorder, that is, persistent, unnecessary and uncontrollable thoughts about irrelevant events after trauma, strong desire to avoid mentioning events, sleep disorder, social withdrawal and anxiety disorder with strong vigilance.

References:

Baidu encyclopedia-natural disasters