Question

2. Why are earthquakes said to be a Sudden onset hazard?​

Answer 1

Natural Hazards and Natural Disasters

A natural hazard is a threat of a naturally occurring event will have a negative effect on humans. This negative effect is what we call a natural disaster. In other words when the hazardous threat actually happens and harms humans, we call the event a natural disaster.

Natural Hazards (and the resulting disasters) are the result of naturally occurring processes that have operated throughout Earth's history.

Most hazardous process are also Geologic Processes.
Geologic processes effect every human on the Earth all of the time, but are most noticeable when they cause loss of life or property. If the process that poses the hazard occurs and destroys human life or property, then a natural disaster has occurred. Among the natural hazards and possible disasters to be considered are:
Earthquakes
Volcanic Eruptions
Tsunami
Landslides
Subsidence

Floods
Droughts
Hurricanes
Tornadoes
Asteroid Impacts

All of these processes have been operating throughout Earth history, but the processes have become hazardous only because they negatively affect us as human beings.

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Answer 2

Answer:

search from internet or the book from which you have written question