Which Rocks term is correctly associated with rock classification: “an intrusive igneous rock”, and also with “formed by slow cooling of magma below the surface”?

Correct Answer: Option A — Granite. Granite is correct because it is an intrusive igneous rock. Granite is also associated with formed by slow cooling of magma below the surface. 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 B — Basalt: It is an extrusive igneous rock and is associated with formed by rapid cooling of lava at the surface; those are the identifying facts of Basalt. Option C — Pumice: It is a vesicular volcanic rock and is associated with formed when gas-rich lava cools rapidly; those are the identifying facts of Pumice. Option D — Obsidian: It is a volcanic glass and is associated with formed by extremely rapid cooling of silica-rich lava; those are the identifying facts of Obsidian. Exam Takeaway: Link Granite with “an intrusive igneous rock” and “formed by slow cooling of magma below the surface” for quick revision.