Which Rocks term is correctly associated with formation process: “formed by compaction and cementation of sand grains”, and also with “often shows bedding layers”?

Correct Answer: Option B — Sandstone. Sandstone is correct because it is formed by compaction and cementation of sand grains. Sandstone is also associated with often shows bedding layers. A further identifying fact is that Sandstone is often shows bedding layers. Another useful fact is that Sandstone is associated with commonly used as a building stone. Why the other options are incorrect: Option A — Limestone: It is commonly formed from calcium carbonate remains or precipitation and is associated with reacts with dilute acid; those are the identifying facts of Limestone. Option C — Shale: It is formed from compacted mud and clay and is associated with splits into thin layers called fissility; those are the identifying facts of Shale. Option D — Marble: It is formed mainly by metamorphism of limestone and is associated with has interlocking calcite crystals; those are the identifying facts of Marble. Exam Takeaway: Link Sandstone with “formed by compaction and cementation of sand grains” and “often shows bedding layers” for quick revision.