Question

Which BEST describes the physical properties of the Earth’s core?
A semi-molten
B water and organic substances
C a solid lower part and a liquid upper part
D contains volcanic, sedimentary and granitic rocks

Answer 1

C — a solid lower part (inner core) and a liquid upper part (outer core). The inner core is solid iron–nickel, while the outer core is molten iron–nickel; convection in the liquid outer core produces Earth's magnetic field.