Hello. can somebody me with this question. also, provide a detailed explanation with your answer. in advance!

Yuauhahahanqqnnqhahajna

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water