Extrusive is the ideal solution. When magma escapes and cools above (or very close to) the Earth's surface, igneous rock known as extrusive or volcanic rock is created.
These are the rocks that are produced by erupting volcanoes and gushing fissures. When exposed to the relatively cool temperature of the atmosphere, the magma, known as lava when molten rock erupts on the surface, cools and solidifies nearly instantaneously. These rocks have an extremely fine-grained or even glassy texture because of the rapid cooling, which leaves little time for mineral crystals to develop. The quenched lava frequently has a frothy, vesicular structure as a result of hot gas bubbles being trapped there.
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