1.43 explain the high melting and boiling points of substances with giant covalent structures in terms of the breaking of many strong covalent bonds

Giant covalent structures are very like giant ionic structures only they do not have charged ions. Instead, all atoms are bonded to each other by strong covalent bonds. There are a lot of these bonds which means it takes a lot of energy to break them, therefore they have very high melting and boiling points