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Last Updated: Tuesday February 28 2006 16:23 GMT

Do volcanoes do anything good?

Galeras volcano in Colombia

People tend to think of volcanoes as destructive but they can have some benefit.

Volcanic ash is very good for soil, so plants can grow quickly and strong after a volcano.

Volcanic slopes left after an eruption are very steep, so if rare and delicate plants and animals set up home there they are naturally protected.