Cameroon GCE O-Level Geology Practice Questions - Cameroon General Certificate Of Education Ordinary Level Geology (Code 0555) Exam

The inner core is composed of pure silicon dioxide which has an extremely high boiling point. Immense lithostatic pressure at the Earth's center raises the melting point of the iron-nickel alloy above the ambient temperature. Continuous nuclear fission in the outer core keeps only the outer layer molten. The inner core lacks radioactive elements and is therefore frozen at absolute zero.