http://answers.yahoo.com/question/index?qid=20081108102108AA3CnBd
The lava emerged from volcano and spread around is rich in Fe and Mg which becomes land fertile to crops. So the people always come back after the disaster.
Volcano doesn't advert. It suddenly starts eruption. Lava flattens and burns everything along it passes. Ashes can reach far away from the volcano, covering the area at all. Gases from the eruption are too toxic and danger to the atmosphere. Great eruptions can provoke climate changing all over the world by means of ashes and gases.
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