How far down is the molten core?
And what would it’s volume be compared to the ocean’s?
Appears that the inner core is 750 mi in diameter, surrounded by an outer core that is 1400 mi thick.
Applying our volume formula:
Volume of core = 4/3 * pi * r^3
= 4/3 * pi * (1400 + 750/2)^3
= 4/3 * pi * 5592359375
= 23,425,252,581 As a percentage of the earth's volume, the core is
= 23,425,252,581 / 260,711,886,825
= 9%