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A natural disaster can be defined as: “A major event brought about by the natural processes of the Earth that causes widespread destruction to the environment and loss of life.” ... Certain natural disasters such as wildfires cause destruction of animal habitat as well as damage to property and loss of life.

Stepping back from the heartbreak and emotional side of such events, a natural disaster is a major weather event resulting from natural processes of the Earth. Such examples include floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, and other less common geological movements.

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martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.