What do you mean by natural disasters?

Natural disasters are natural disasters.

Natural variations on the earth, including those induced by human activities, occur all the time. When this mutation brings harm to human society, it constitutes a natural disaster. So it is famous for the idiom "natural and man-made disasters".

Common natural disasters such as earthquake, tsunami, flood, mangosteen typhoon, volcanic eruption, etc. Drought, storm, snowstorm, thunderstorm, sandstorm, acid rain, hail, tornado, meteorite falling to the earth and other small natural disasters. These disasters are often caused by the serious side effects of nature and the poor operation of celestial bodies, and more are non-human disasters caused by the chaotic collapse of the earth's ecological environment.

Causes of natural disasters:

The process of natural disasters is long and short, slow and urgent. Some natural disasters, when the change of disaster-causing factors exceeds a certain intensity, will show disaster behavior in days, hours or even minutes and seconds.

For example, volcanic eruption, earthquake, flood, hurricane, storm surge and hail are called sudden natural disasters. Drought, crop and forest diseases, insects, weeds, etc. Although disasters usually occur within a few months, the formation and end of disasters are relatively fast and obvious, so they are also included in sudden natural disasters.

There are also some natural disasters, such as land desertification, soil erosion and environmental degradation, which are gradually emerging under the condition of long-term development of disaster-causing factors. This kind of disaster usually takes several years or more to form, so it is called slow-onset natural disaster.