Name two other substances with giant covalent structures

Diamond and graphite forms of carbon, silicon dioxide (silica)

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Diamond and graphite forms of carbon) and silicon dioxide (silica) are examples of giant covalent structures (lattices) of atoms. All the atoms in these structures are linked to other atoms by strong covalent bonds and so they have very high melting points.

u i forgot the answer?

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence