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Limestone is a sedimentary rock, and marble is a metamorphic rock. Even though limestone and marble have the same chemical makeup, they are classified as different rocks. Why is this so?

A. The limestone took much longer to form than the marble.
B. They formed at different times in Earth's history.
C. Limestone formed from compaction and cementation while marble is formed when exposed to increasing temperature and pressure.
D. Limestone is found deep within Earth's crust while marble is found closer to Earth's surface.

Answer :

Final answer:

Limestone and marble, although they have the same chemical composition, are classified as different rocks because they were formed through different processes.


Explanation:

Limestone is classified as a sedimentary rock and marble is classified as a metamorphic rock, despite having the same chemical composition. This is because they were formed through different processes. Limestone forms through the accumulation of sediment, which is then compacted and cemented together. Marble, on the other hand, is formed from limestone that is subjected to high temperature and pressure, causing the minerals to recrystallize and form a new rock with different properties.


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