They go faster through the inner core than the liquid outer core.
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The center of the Earth is a solid ball of iron-nickel alloy called the inner core.
The Inner (solid) and Outter (liquid) Core are made up of Nickel and Iron.
They show that the outer core of the Earth is liquid while the inner core is solid.
no it is not true. there is solid iron and nickel in the Earths core
The solid state of of the inner core is due to pressure caused by the weight of everything above it.