* Extrusive Igneous Rocks: These rocks form directly from the cooling and solidification of lava on the Earth's surface.
* Basalt: Formed from the cooling of fluid, mafic lava, often found in shield volcanoes.
* Andesite: Formed from intermediate lava, often found in stratovolcanoes.
* Rhyolite: Formed from viscous, felsic lava, often found in explosive eruptions.
* Obsidian: A glassy, volcanic rock that cools quickly.
* Pumice: A porous, lightweight rock formed from frothy lava.
* Pyroclastic Rocks: These rocks are formed from the accumulation and consolidation of volcanic debris, such as ash, pumice, and blocks.
* Tuff: A consolidated volcanic ash.
* Breccia: A rock formed from angular volcanic fragments.
* Agglomerate: A rock formed from rounded volcanic fragments.
So, the rock formed after a volcanic eruption can be a variety of types, depending on the composition of the magma and the way it erupts.
