How long do egg shells take to decompose?

A typical egg shell would likely decompose in between two to four weeks before decomposition of the egg shell starts and when it decomposed completely. They are one of the things that decompose quickly base on the amount of time that they last.

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halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).