Network solids are made of atoms, in which each atom is covalently bonded to each of its neighbors.
This means that a network solid is, in essence, a single molecule. As a result, they have extremely high melting points, since melting requires actually breaking bonds (instead of just disrupting an intermolecular force.)
There are many different network solids, but three that you should know something about are:
graphite,
diamond, and
quartz
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