* Continental plates are primarily made of felsic rocks, which are rich in silica and have a lighter color. These rocks are generally granite and its metamorphic equivalents.
* Oceanic plates are primarily made of mafic rocks, which are lower in silica and have a darker color. These rocks are generally basalt and its metamorphic equivalents.
However, it's important to remember that both types of plates are composed of various minerals, not just silica. These minerals contribute to the overall composition and properties of the plates.
