Describe differences in characteristics between the outer core and inner core?

This inner core is solid because it is pure iron, while the outer core has other impurities that lower its melting point. Think of it like freezing a soda- the ice forms as pure ice, while the rest of the soda gets more syrupy. The main difference is that unlike ice, solid iron sinks instead of floating.

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when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation: