Multiple choice

Marble is a changed form of which of the following?

  1. graphite

  2. coal

  3. limestone

  4. basalt
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Marble is a metamorphic rock formed from limestone under heat and pressure. Both marble and limestone are primarily composed of calcium carbonate (CaCO3). The metamorphic process recrystallizes the calcite in limestone, giving marble its characteristic crystalline structure. Graphite and coal are carbon-based, while basalt is an igneous rock.

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