1) What is the thinnest layer? a) Inner Core b) Outer Core c) Crust d) Mantle 2) What is the thickest layer? a) Inner Core b) Outer Core c) Crust d) Mantle 3) Which layer is made of liquid iron and nickel? a) Inner Core b) Outer Core c) Crust d) Mantle 4) Which layer is made of solid iron and nickel? a) Inner Core b) Outer Core c) Crust d) Mantle

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