I can distinguish different rocks that are produced by lava flows.

When a volcano erupts it lets out a pyroclastic flow which can be ash, dust or rocks. The different types of rocks are distinguished by its features. Volcano blocks are rocks that were present at the time of the eruption. Volcano bombs are rocks that are made of magma and produced by magma hardening. Volcano blocks have sharp/rough edges and volcano bombs are smooth with magma still visible within it.