Check out the volcano tours offered by Volcano-Adventures!
Volcanoes & Earthquakes - new app for Android
Guaranteed tours:
14-21 Jan: Erta Ale Volcano Special - Danakil desert (Ethiopia)
14-24 Jan: Erta Ale Volcano Special - Danakil desert (Ethiopia)
4-17 Feb: Desert, salt and volcanoes - Danakil desert (Ethiopia)
12-18 Mar: Kilauea Volcano Special - Big Island, Hawaiʻi
6-21 May: From Krakatau to Bali - Java (Indonesia)
13-21 May: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
20-27(28) May: Fascination Volcano - Santorini Island (Greece)
29 May - 3 Jun: Aegean's Hidden Gem: Isle of Milos - Milos Island (Greece)
3-18 Jun: From Krakatau to Bali - Java (Indonesia)
4-11 Jun: Nyiragongo Lava Lake & Mountain Gorillas - DR Congo + Rwanda
: spaces available / : guaranteed / : few spaces left / : booked out

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Random pictures

Illustrated Volcano Glossary

obsidian

Volcanology
Obsidian from the Rocce Rosse lava flow on Lipari island (Italy)
Obsidian from the Rocce Rosse lava flow on Lipari island (Italy)
Detail of obsidian with spherolites (small bubbles where the glass has crystallized around the bubble)
Detail of obsidian with spherolites (small bubbles where the glass has crystallized around the bubble)
Black volcanic glass
Obsidian is a naturally occurring glass formed as an extrusive igneous rock. It is produced when felsic lava extruded from a volcano cools rapidly through the glass transition temperature and freezes without sufficient time for crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where cooling of the lava is rapid. Because of the lack of cr... -> See whole entry

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perlite - Pumice - photoglossary.html

 

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