Which type of rock is NOT primarily associated with volcanic activity?

Sedimentary rock is not primarily associated with volcanic activity because it forms from the accumulation and compaction of sediments, which can include fragments of other rocks, minerals, and organic material, rather than through volcanic processes. Volcanic activity is primarily associated with igneous rocks, which originate from the cooling and solidification of magma or lava. This process can lead to the formation of both intrusive igneous rocks, which crystallize below the Earth's surface, and extrusive igneous rocks, which solidify quickly on the surface after a volcanic eruption.

Metamorphic rock, on the other hand, is created from the transformation of existing rock types due to high temperature and pressure but does not directly form from volcanic activity. Therefore, while igneous and extrusive rocks are closely linked to volcanic processes, sedimentary rock represents a different geological process, making it the appropriate choice for this question.