How do we know the centre of the earth is Iron?

Question

Like how are scientists 100% sure when we’ve never dug that far down

Thanks in advance

In: 23

Answer 1

>Like how are scientists 100% sure when we’ve never dug that far down

Scientists are not 100% sure because they have never dug that far down. What they have is a best guess; a preponderance of evidence. We know the volume and mass of the Earth. We know the seismic echos and what the density of the materials would need to be to produce those echos. A molten iron core is the best fit.