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rock > igneous rock > volcanic rock

volcanic rock
subject			fact

volcanic rock	is a kind of igneous rock
	has solidification mechanism extrusion onto the surface of the planet or asteroid via a volcanic eruption
	has solidification timescale very rapid
igneous rock	has composition silicates (with very few exceptions)
rock	has part mineral
	has texture
	has genesis

Kinds of volcanic rock :

• agglomerate (3 facts) - a fragmental rock dominated by rounded clasts larger than 64 mm in diameter or length
• basalt (2 kinds)
• depleted basalt (1 kind, 3 facts)
• lava (1 kind, 2 facts) -
• obsidian (3 facts)