Which Rocks term is correctly associated with rock classification: “a sedimentary carbonate rock”, and also with “commonly formed from calcium carbonate remains or precipitation”?

Correct Answer: Option A — Limestone. Limestone is correct because it is a sedimentary carbonate rock. Limestone is also associated with commonly formed from calcium carbonate remains or precipitation. A further identifying fact is that Limestone is reacts with dilute acid. Another useful fact is that Limestone is associated with a major raw material for cement. Why the other options are incorrect: Option B — Shale: It is a fine-grained sedimentary rock and is associated with formed from compacted mud and clay; those are the identifying facts of Shale. Option C — Marble: It is a metamorphic rock and is associated with formed mainly by metamorphism of limestone; those are the identifying facts of Marble. Option D — 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. Exam Takeaway: Link Limestone with “a sedimentary carbonate rock” and “commonly formed from calcium carbonate remains or precipitation” for quick revision.