Volcanic rock

Volcanic rock is a type of igneous rock that forms from the solidification of lava or magma that has erupted onto the Earth's surface during a volcanic eruption. These rocks can vary in texture and composition, often containing minerals such as quartz, feldspar, and olivine, and are typically classified into two main categories: extrusive rocks, which cool quickly on the surface, and intrusive rocks, which cool slowly beneath the surface.