The core of Earth is made up of

Options :
  1. mainly of iron in the liquid form
  2. mainly of nickel in the liquid form
  3. both iron and silica in the liquid form
  4. both iron and magnesium in the plastic state
Answer and Explanation :-

Answer: Option 4

Explanation:

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HELP!"I race to the square, crossing it, looking all around, listening out-No.No.It's empty.Viola's breathing heavy in my arms .And Haven is empty.I reach the middle of the square.I don't see nor hear a soul.I spin around again."HELP!" I cry.But there's no one.Haven's completely empty.There ain't hope here after all.
-Patrick Ness The Knife of Never Letting Go