The lava flow emerging from its tube. Caused by friction and the sudden contact with cold air, successive segments of crust form at the exit, resulting in a progressive downstream growth of the tube's roof. (Photo: Tom Pfeiffer)
Vulkane Italiens - order online 88 pages, brilliant color photos, German language - this beautifully illustrated guidebook is a perfect introduction and companion for all interested in Italy's rich and varied volcanic areas.
Worldwide earthquake activity level What is the level of global earthquake activity today compared to the past? Find out with our graph showing the current and past Global Seismic Activity Level indicator!
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