Ineed describing how a limestone rock is likely to change over a long period of !

Igneous rocks are formed when rock is super-heated and becomes molten (liquid). There are two kinds of molten rock: magma (found beneath the Earth’s surface) and lava (found on the Earth’s surface). The molten rock cools and hardens on or beneath the Earth’s surface forming a variety of igneous rock. Two examples are granite and basalt.

After a long period of time, if a limestone has undergone extreme heat and pressure from below the Earth's surface, its configuration and composition changes to form a recrystallized limestone known as marble, which can contain over 95% calcium carbonate.

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