Do volcanoes do anything good?

  • 22 June 2011
Galeras volcano in Colombia Image copyright AP

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.