Match each rock listed in Column I with its correct classification, characteristic texture, or primary economic application in Column II.
- ObsidianExtrusive igneous rock with a glassy texture formed by rapid cooling of lava
- GypsumChemical sedimentary rock formed by evaporation, widely used in making plaster of Paris
- AnthraciteHigh-rank organic metamorphic rock with high carbon content, used as a clean-burning fuel
- QuartziteHard, non-foliated metamorphic rock derived from quartz sandstone, resistant to weathering
Answer
Obsidian matches with the extrusive igneous rock with a glassy texture; Gypsum matches with the chemical sedimentary rock formed by evaporation used for plaster of Paris; Anthracite matches with the high-rank organic metamorphic rock used as fuel; Quartzite matches with the hard, non-foliated metamorphic rock derived from quartz sandstone.
Each rock is paired accurately according to its genetic rock family and physical/economic properties: Obsidian is a glassy extrusive igneous rock, Gypsum is an evaporite chemical sedimentary rock used in construction, Anthracite is an organic metamorphic coal with high heat value, and Quartzite is a durable metamorphic rock derived from sandstone.
Step-by-Step Solution
Key Concept
Rock Types, Formation, and Economic Importance