Question

one similarity between the inner core and Outer core of the earth

Answer 1

They are both composed primarily of the elements iron and nickel

Answer 2

The inner core and the outer core are made up of similar stuff chemically (both are made mostly of iron, with a little nickel and some other chemical elements)--the difference between them is that the outer core is liquid and the inner core is solid.

bro this question is of geography.