Answer the following question given this paragraph: 

One type of molecular compound behaves quite differently than that described so far. A covalent network solid is a compound in which all of the atoms are connected to one another by covalent bonds. Diamond is composed entirely of carbon atoms, each bonded to four other carbon atoms in a tetrahedral geometry. Melting a covalent network solid is not accomplished by overcoming the relatively weak intermolecular forces. Rather, all of the covalent bonds must be broken, a process that requires extremely high temperatures. Diamond, in fact, does not melt at all. Instead, it vaporizes to a gas at temperatures above 3500°C.


Q: What is a compound in which all of the atoms are connected to one another by covalent bonds?

 Choices:

- covalent bond element

- covalent mixture

- compound metal

- covalent network solid

A:
covalent network solid
