英语达人帮一下~有关自然灾害的问题~~急~

A natural disaster is caused by nature, such as floods, volcanic eruptions, earthquakes, tsunamis, avalanches, lahars (volcanic mudslides), landslides, sinkholes, blizzards, drought, hailstorms, heat waves, hurricanes, tropical storms, typhoons, Ice Ages, tornadoes, and wildfires. Epidemics caused by bacteria or viruses are sometimes considered natural disasters, but sometimes put into a different category. A biological threat such as locusts or toxic fungi could also be considered a natural disaster.

Some disasters are on the edge of natural and non-natural. Famines, the chronic lack of food, may be caused by a combination of natural and human factors. Two space-originating categories of natural disaster, both of which rarely effect humans on the surface, include asteroid impacts and solar flares. Although the risk of asteroid impact in the short term may be low, some scientists argue that in the long term, the likelihood of death by asteroid is similar to that of death