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Volcano Tours
Our expert volcanologists and photographers offer unique travel experiences: volcano expeditions, photo tours, and relaxed walking & study tours.
Guaranteed tours
8-16 May 2021: From Stromboli to Etna - Sicila and Eolian Islands (Italy)
24 Jun - 8 Jul 2021: Colors of Iceland: Fire, Earth, Ice and Water - Iceland
30 Jul - 13 Aug 2021: Colors of Iceland: Fire, Earth, Ice and Water - Iceland
: spaces available / : guaranteed / : few spaces left / : booked out

Geology glossary

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viscosity

Volcanology
The ability of a liquid to flow. Basalt magma has a relatively low viscosity making it runny, whereas rhyolite magma has a high viscosity making the magma thick and sticky.

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