A set of statements about graphite and silicon(IV) oxide, $\text{SiO}_2$, is given. Which statement is correct?
- ASilicon(IV) oxide is found as an impurity in iron ore.
- BThe angles between the atoms in silicon(IV) oxide and graphite are the same.
- CThe melting points of silicon(IV) oxide and graphite are high because ionic bonds are stronger than covalent bonds.
- DWhen graphite acts as a lubricant, the covalent bonds between the layers are broken.