This molten earth origin is what classes rainbow obsidian as an igneous rock. Lava destined to become obsidian cools rapidly once on the surface and, thanks to its viscous nature, is also below ...

Head to an area with deep caves and you’ll encounter volcanic rock and magma pools ... Near spots with obsidian and molten ...

Igneous rocks are made when liquified rock, called magma or lava, cools and solidifies. Well-known igneous rocks are obsidian and granite. Submit photos or videos of your students participating to ...