Definition of "volcanic rock" [volcanic rock]

• Extrusive igneous rock solidified near or on the surface of the Earth (noun)

WordNet. Princeton University. 2010.

• "What we now call Bali is just one promontory in a zone of shallow ocean and volcanic rock known as the Sunda Shelf, which includes also Java, Sumatra, Borneo, the Java Sea, and the Gulf of Thailand."
• "The southern half of the island is different, a brownish cow-pie of old lava, and since this volcanic rock is easily crumbled by erosion, the soil is softer."
• "Madeira is a steep hump of volcanic rock that rises to six thousand feet, with a high central crest standing exposed to tropical breezes and storms, and a series of ridges dropping transversely from the crest, like ribs from the backbone of an emaciated horse."