Limestone is a hard rock composed mostly of what?

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Multiple Choice

Limestone is a hard rock composed mostly of what?

Explanation:
Limestone is a sedimentary rock whose defining feature is a carbonate-rich mineral content. The main component is calcium carbonate, typically in the minerals calcite or aragonite. When magnesium partly replaces calcium, the rock becomes dolomite (CaMg(CO3)2), known as dolomitic limestone. This carbonate makeup is what distinguishes limestone from rocks dominated by silicon dioxide (quartz), aluminum oxide, or magnesium sulfate, which are not carbonate rocks. So limestone is composed mostly of calcium carbonate or dolomite.

Limestone is a sedimentary rock whose defining feature is a carbonate-rich mineral content. The main component is calcium carbonate, typically in the minerals calcite or aragonite. When magnesium partly replaces calcium, the rock becomes dolomite (CaMg(CO3)2), known as dolomitic limestone. This carbonate makeup is what distinguishes limestone from rocks dominated by silicon dioxide (quartz), aluminum oxide, or magnesium sulfate, which are not carbonate rocks. So limestone is composed mostly of calcium carbonate or dolomite.

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