Answer:
Limestone is a type of sedimentary rock which is composed mainly of skeletal parts of organisms living in water. Some of which are, coral, forams and molluscs.
Over time limestone can be deformed and crystallized
Limestone and chalk are mostly made up of calcium carbonate. When acidic rainwater falls on limestone or chalk, these rocks may react with the rainwater, causing the rock to be weathered.
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.
Most limestones actually start as calcium carbonate mud or shells precipitated by organisms in reefs or shallow shelf regions - the biosphere. Over time, the limestone is broken down into its chemical parts and may come back to the surface as volcanic CO2.
Fun Fact!! Limestone is used in building and construction works. It also finds application in chemical industries.
limestone can be weathered if subjected extensively to denudation forces such as wind, water and glaciation. Water is more potent for the chemical weathering of limestone. Limestone would easily and readily dissolve in it over a long period of time.
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