Limestone and marble are made of the same components. Limestone is a sedimentary rock, and marble is a metamorphic rock.

Which of these is the BEST answer that explains how these rocks are different?

A. Limestone forms from the compression of organic material, while marble forms from volcanic activity.
B. Limestone is composed of calcium carbonate, while marble is composed of quartz.
C. Limestone undergoes a change in texture and mineral composition due to heat and pressure, becoming marble.
D. Limestone is always softer and less durable than marble.

Limestone is a sedimentary rock that forms from compressed organic materials, while marble is a metamorphic rock that forms when limestone undergoes changes in texture and mineral composition due to heat and pressure.

Explanation:

The key difference between limestone and marble lies in the process that forms them. Limestone is a type of sedimentary rock that forms from the compression of shells of living organisms or fragments of igneous rock deposited by wind or water and cemented together. It is composed mainly of calcium carbonate. Marble, on the other hand, is a type of metamorphic rock.

When limestone is subject to high temperature and pressure, it undergoes a change in texture and mineral composition to form marble. Therefore, the best answer is c) Limestone undergoes a change in texture and mineral composition due to heat and pressure, becoming marble.

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