Which Rocks term is correctly associated with identifying feature: “coarse-grained with visible crystals”, and also with “widely used as building and decorative stone”?

Correct Answer: Option C — Granite. Granite is correct because it is coarse-grained with visible crystals. Granite is also associated with widely used as building and decorative stone. A further identifying fact is that Granite is coarse-grained with visible crystals. Another useful fact is that Granite is associated with widely used as building and decorative stone. Why the other options are incorrect: Option A — Basalt: It is dark-coloured and fine-grained and is associated with common in oceanic crust and lava plateaus; those are the identifying facts of Basalt. Option B — Pumice: It is so porous that some pieces can float on water and is associated with used as an abrasive and lightweight aggregate; those are the identifying facts of Pumice. Option D — Obsidian: It is glassy texture with conchoidal fracture and is associated with historically used for sharp cutting tools; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “coarse-grained with visible crystals” and “widely used as building and decorative stone” for quick revision.