John Seach, Volcano Live

 Extrusive Rocks - John Seach

Extrusive rocks are formed from lava. They have been erupted onto the earth's surface.

Basalt
Andesite
Dacite
Rhyolite
Glasses - Obsidian, Pichstone, Pumice.
Tuff
Trachytes
 

Extrusive Rocks
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