Answer:
Covalent network solids typically have high melting points and high boiling points
Step-by-step explanation:
Covalent solids are the solids which have covalent bonds as intermolecular or interatomic interactions.
As covalent bonds are very strong, these solids are generally characterized by high melting points and high boiling points.
The examples of such solids are: Diamond and Graphite.
The other classes of solids are
i) ionic
ii) molecular
iii) metallic.