Which Rocks term is correctly associated with formation process: “formed from compacted mud and clay”, and also with “splits into thin layers called fissility”?

Correct Answer: Option B — Shale. Shale is correct because it is formed from compacted mud and clay. Shale is also associated with splits into thin layers called fissility. A further identifying fact is that Shale is splits into thin layers called fissility. Another useful fact is that Shale is associated with can metamorphose into slate. Why the other options are incorrect: Option A — Marble: It is formed mainly by metamorphism of limestone and is associated with has interlocking calcite crystals; those are the identifying facts of Marble. Option C — Slate: It is formed mainly from shale under pressure and heat and is associated with splits into smooth thin sheets; those are the identifying facts of Slate. Option D — Quartzite: It is formed from sandstone rich in quartz and is associated with very resistant to weathering; those are the identifying facts of Quartzite. Exam Takeaway: Link Shale with “formed from compacted mud and clay” and “splits into thin layers called fissility” for quick revision.