Limestone is formed primarily through . chemical interactions between ocean bottom sediments and ions in sea water direct precipitation from seawater biochemical sediments secreted by marine organisms evaporation of calcite rich seawater

Limestone is a carbonate sedimentary rock that is often composed of the skeletal fragments of marine organisms such as coral, foraminifera, and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).

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a. an ice age

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