What type of rock is primarily associated with volcanic activity?

Igneous rocks are primarily associated with volcanic activity because they form directly from the cooling and solidification of molten rock, or magma. When magma erupts through a volcano, it is referred to as lava. As this lava cools down, it crystallizes into igneous rock. This process is a hallmark of both intrusive igneous rocks, which form beneath the Earth's surface, and extrusive igneous rocks, which form on the surface from volcanic eruptions.

The presence of these rocks at or near volcanic sites is a key indicator of past volcanic activity, showcasing the dynamic processes of the Earth's crust. In contrast, sedimentary rocks are formed from the accumulation of sediments, while metamorphic rocks arise from the transformation of existing rocks under heat and pressure, none of which are directly linked to volcanic processes. Organic rocks are formed from the accumulation of plant or animal remains and do not pertain to volcanism at all.