If an option calls the core SIAL why is it wrong?

Correct answer: SIAL is associated with silica- and aluminium-rich lighter crustal materials, whereas the core is associated with NIFE

SIAL is derived from silica (Si) and aluminium (Al), and it is associated mainly with the relatively lighter materials of the continental crust. In contrast, the core is called NIFE because nickel (Ni) and iron (Fe) are its major constituents. Therefore, calling the core SIAL is incorrect. Exam tip: remember SIAL for the crust and NIFE for the core.