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Etna volcano photos Etna - Europe's largest and most active volcano is a universe in itself. Browse through our collection spanning almost 20 years of eruptions and more.
Divergent plate boundaries in oceans Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.
Worst earthquakes of the 20th century More than 1.5 million people lost their lives because of earthquakes in the 20th century. Check the list of damaging and deadly quakes from 1900-1999!