Which rocks are formed from hardened volcano lava?

Answer

The extrusive igneous rocks are formed from the hardened lava that flowed from volcanoes. Examples of extrusive igneous rocks are obsidian, basalt, pumice, and rhyolite.
Q&A Related to "Which rocks are formed from hardened volcano..."
Igneous rocks like basalt are formed from volcanic lava.
http://wiki.answers.com/Q/Which_rocks_are_formed_f...
Extrusive igneous rocks are formed at the Earth's surface as a
http://www.chacha.com/question/what-type-of-rock-i...
Vasicular, vesicular, not sure how to spell it.
http://answers.yahoo.com/question/index?qid=201211...
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