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Correct Answer: Option B — Granite. Granite is correct because it is formed by slow cooling of magma below the surface. Granite is also associated with coarse-grained with visible crystals. 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 formed by rapid cooling of lava at the surface and is associated with dark-coloured and fine-grained; those are the identifying facts of Basalt. Option C — Pumice: It is formed when gas-rich lava cools rapidly and is associated with so porous that some pieces can float on water; those are the identifying facts of Pumice. Option D — Obsidian: It is formed by extremely rapid cooling of silica-rich lava and is associated with glassy texture with conchoidal fracture; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “formed by slow cooling of magma below the surface” and “coarse-grained with visible crystals” for quick revision.
