how do scientists know the Earth’s core is liquid if no one has ever seen it or extracted a sample?

Question

how do scientists know the Earth’s core is liquid if no one has ever seen it or extracted a sample?

In: Earth Science

Answer 1

In the old days, 30 or 40 years ago, it was thought that the core was liquid. Now it’s believed that there is a solid core surrounded by liquid. I lost a bet over this with my son.