volcanoes with silica rich rock

News 92 FM—April 22nd, 2012

Igneous rock - Wikipedia, the free encyclopedia
Chemical: total alkali-silica content (TAS diagram) for volcanic rock classification . intrusive rock (crystallized at depth), with felsic composition (rich in silica and .
http://en.wikipedia.org/wiki/Igneous_rock

List of rock types - Wikipedia, the free encyclopedia
Basanite - a volcanic rock of mafic composition; essentially a silica . porous, yellow sandstone: Jaspillite - an iron-rich chemical sedimentary rock similar to chert .
http://en.wikipedia.org/wiki/List_of_rock_types

Obsidian
However, the best quality obsidian often forms below the ground surface around volcanic vents. Silica-rich magma squeezes into rock fractures to form layers .
http://volcano.oregonstate.edu/education/facts/obsidian.html

Volcanoes & Japan
Jul 10, 2005 . Many Japanese volcanoes are largely composed of silica-rich rocks such as dacite and andesite and are prone to highly explosive eruptions .
http://jove.geol.niu.edu/students/mdare/VirtualFieldTrip/Mt_Fuji/volcanoinfo.htm

Where do volcanoes with silica rich rocks occur
Relevant answers: Where are volcanoes with silica-rich and quartz-rich rocks found? Italy. What is the shape of volcanoes with silica rich and quartz rich rocks?
http://wiki.answers.com/Q/Where_do_volcanoes_with_silica_rich_rocks_occur

The Rock Cycle Homework
The Rock Cycle Homework Tasks. Spellings and Definitions .
http://www.ailwyn.schoolzone.co.uk/homework/science/hwk%20web%20pages/8h.htm