Volcanic rocks are formed through a volcanic eruption.
When rocks under the surface of earth heat up due to high temperatures,they form a liquid know as magma, which bursts as a result of the increased pressure underneath.The magma then cools and solidifies on the earth's surface to form volcanic mountains(rocks).
Volcanic rocks include;Pumice,Scoria,Andesite,Basalt,Phonolite,Obsidian,Tephrite,Rhyorite and Tryachite.
maurice.mutuku answered the question on May 29, 2017 at 07:11
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