How Igneous Rocks Form: Basalt, Obsidian, and Granite Explained #141804 (License: Personal Use)

This educational diagram depicts a volcanic system with subsurface magma chambers feeding surface eruptions. Basalt forms from rapidly cooled extrusive lava, obsidian results from ultra-fast cooling of felsic lava (creating natural glass), and granite solidifies slowly underground as intrusive igneous rock. Each rock type is labeled and shown in context with its formation environment.

Used in geology education pages, earth science curricula, or museum exhibits to explain rock cycle fundamentals; targets students, educators, and curious learners seeking visual clarification of igneous rock origins.