What are eggshells made of

An Egg shell is a shell structure that is meant to protect what is inside of the egg. Eggshell’s are made out of almost entirely calcium carbonate crystals, limestone and marble, are also made out of calcium carbonate. Air is able to pass through tiny pores of the eggshell so the offspring can breathe or get water.
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How are eggshells produced?

Inside a hen the beginning of an egg is the tiny ovum which takes a week to grow into a proper egg yolk. The egg continues down into the uterus where the shell is added. The shell is made from calcium carbonate. The shell is on average only 0.3mm thick but it is really strong. The color of the shell depends on the breed of bird and on the individual chicken itself.
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An egg is a dome like structure, meaning like other dome like structures it takes force from the top and flows out. Eggs are stabilized with a protein matrix so the eggs can last longer.
The smallest egg in the world is measured 7 mm in length, 5.25 mm in diameter and weighed 0.027 g. The largest egg in the world is weighed 2.589 kg, on average an ostrich egg is 15 cm and weighs 1.4 kilograms almost 2 times the weight. The everyday eggs we use can withstand 1.7 kilograms to 1.9 kilograms of pressure. It is not possible for someone to break an egg in their hand just applying force
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