Is Earth's inner core solid or liquid? While the inner core is extremely hot, experts have known that it is solid for many ...

Scientists have long thought Earth's inner core is like a huge solid metal ball. But an experiment revealed it may be a lot softer — more like butter, a lead scientist said.

Oct. 6, 2021 — New research suggests that Earth's 'solid' inner core is, in fact, endowed with a range of liquid, soft, and hard structures which vary across the top 150 miles of the inner ...