Igneous rock is formed by the cooling and solidification of molten earth materials. igneous rock forms when magma or lava cools. if igneous rock forms above ground after a volcanic eruption, it forming igneous rock, such as obsidian which is a naturally occurring volcanic glass. a) cools quickly, extrusive b) cools quickly, intrusive c) cools slowly, extrusive d) cools slowly, intrusive

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