Illustration depicting different types of rock, all of which are of volcanic origin. They are clockwise from top left vesicular basalt, andesite, tuff, ignimbrite, obsidian, pumice and rhyolite. Editorial Stock Photo - Afloimages
Illustration depicting different types of rock, all of which are of volcanic origin. They are (clockwise from top left): vesicular basalt, andesite, tuff, ignimbrite, obsidian, pumice and rhyolite.