The inner core of Earth is solid iron and nickel. Iron and nickel will melt at temperatures around 1,500°C. The average temperature of the inner core is about 5,000°C. Why then, does the inner core not melt and become a liquid?
O A. The inner core isn't hot enough to melt iron or nickel.
OB. It is impossible to melt iron or nickel because they are metals.
C. The extreme pressure at the center of the Earth keeps the core solid.
D. The outer core is so cold that it keeps the inner core solid.