[Free Registration/Login Required] This PDF passage "If Rocks Could Talk!: Obsidian" from the American Museum of Natural History features an interview with an igneous rock named Obsidian. It is part of a paired text with "If Rocks Could Talk!: Deformed Conglomerate" (click on Paired texts at top of page). Questions are provided for both texts on the "Deformed Conglomerate." Click double arrows on top right to view in presentation mode, print, or download. Free registration is required.