Volcanic Rock - John Seach
(Igneous Rock)

Volcanic rocks are erupted from volcanoes and form from lava or pyroclastic material.

Examples of volcanic rocks
Granite, Pegmatite, Rhyolite, Obsidian, Pitchstone, Pumice, Tuff, Syenite, Trachyte, Diorite,
Andesite, Gabbro, Dolerite, Basalt.
 

Igneous Rock
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