What type of rocks were once igneous or sedimentary but have metamorphosed as a result of intense he...........

General Studies (CHSL) Geography

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What type of rocks were once igneous or sedimentary, but have metamorphosed as a result of intense heat and/or pressure

within the Earth's crust?

This questions was previously asked in

SSC CHSL 25th May 2022 Shift-2

View All SSCCHSL Previous Year Papers

Granite

Quartzite

Sandstone

Basalt

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Explanation:

- Quartzite (Option 2) is the correct answer. Quartzite is a metamorphic rock that forms when quartz-rich sandstone undergoes high heat and pressure, causing the grains to recrystallize and form a hard, glassy surface.

- Granite (Option 1) is an intrusive igneous rock composed mainly of quartz, feldspar, and mica. It does not metamorphose from other rocks under heat and pressure, but it can be altered to form gneiss under metamorphic conditions.

- Sandstone (Option 3) is a sedimentary rock formed from compacted sand grains. It is the precursor material that can metamorphose into quartzite under suitable conditions.

- Basalt (Option 4) is an extrusive igneous rock that forms from the rapid cooling of basaltic lava exposed at or very near the surface. It is not a product of metamorphosis from igneous or sedimentary forms.

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