Which of the following is classified as a metamorphic rock? (1) slate (2) shale (3) quartzite. The correct answer is___________?
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Answer: B. both (1) and (3)
Explanation
Slate forms through regional metamorphism of fine-grained sedimentary shale deposits. Quartzite develops when quartz-rich sandstone undergoes intense underground heat and pressure. Both slate and quartzite satisfy the geological definition of true metamorphic rock types. Metamorphic rocks are formed when pre-existing rocks are subjected to intense heat, pressure, and chemical fluids. Sedimentary rocks like shale are deposited in layers before undergoing deep crustal burial and alteration. Geological classification distinguishes rocks by their mineral composition and formation processes.
Architects specify slate for durable roofing tiles and flooring due to its natural cleavage planes. Quartzite is selected for heavy-duty paving and countertops because of its exceptional hardness. Understanding rock classifications helps builders choose appropriate stone materials for construction projects. Option A is incorrect because slate is also a metamorphic rock, not just quartzite alone. Option C incorrectly includes shale, which is classified as a sedimentary rock rather than metamorphic. Option D includes shale, failing to exclude the sedimentary rock from the metamorphic category.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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