Which Rocks term is correctly associated with rock classification: “a metamorphic rock”, and also with “formed mainly by metamorphism of limestone”?

Correct Answer: Option A — Marble. Marble is correct because it is a metamorphic rock. Marble is also associated with formed mainly by metamorphism of limestone. A further identifying fact is that Marble is has interlocking calcite crystals. Another useful fact is that Marble is associated with used in sculpture and architecture. Why the other options are incorrect: Option B — Slate: It is a low-grade metamorphic rock and is associated with formed mainly from shale under pressure and heat; those are the identifying facts of Slate. Option C — Quartzite: It is a hard metamorphic rock and is associated with formed from sandstone rich in quartz; those are the identifying facts of Quartzite. Option D — Granite: It is an intrusive igneous rock and is associated with formed by slow cooling of magma below the surface; those are the identifying facts of Granite. Exam Takeaway: Link Marble with “a metamorphic rock” and “formed mainly by metamorphism of limestone” for quick revision.