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==Conductors, insulators, semiconductors and other interesting things== | ==Conductors, insulators, semiconductors and other interesting things== | ||
[[File:Conductors,insulators,semiconductors.pdf]] | * [[File:Conductors,insulators,semiconductors.pdf]] | ||
* A mineral is a naturally occurring substance, representable by a chemical formula, usually solid and inorganic, carries a crystal structure. The silicate minerals compose over 90% of the Earth's crust. | * A mineral is a naturally occurring substance, representable by a chemical formula, usually solid and inorganic, carries a crystal structure. The silicate minerals compose over 90% of the Earth's crust. |