Volcanoes can be very destructive incidents, causing damage to buildings, injuries, and deaths. Land upheavals of this nature can change the surrounding landscape, blasting away mountain, changing topography, and forming surfaces of cooled lava.

Not only this, but volcanoes can also cause many other natural disasters, including tsunamis, avalanches, and heavy rains that combine with ash to create lahars (volcanic mudflows and debris flows).

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Forces of Nature: ThinkQuest 2000 (Team #C003603)

http://library.thinkquest.org/C003603/english/volcanoes/volcaniceffects.shtml