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eggshell
An eggshell is the outer covering of a hard-shelled egg and of some forms of eggs with soft outer coats. Bird eggshells contain calcium carbonate and dissolve in various acids, including the vinegar used in cooking. While dissolving, the calcium carbonate in an egg shell reacts with the acid to form carbon dioxide.
== Diversity ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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