The table below shows the elements that mainly comprise each of the four layers of Earth: Elements in Layers
Layer Main Elements
Crust Oxygen, Silicon
Mantle Iron, Magnesium
Outer Core Iron, Nickel
Inner Core Iron
Which of these elements make up the layer that is 0.2 to 1.1 percent of Earth's total diameter? (7 points)

a
Oxygen and Silicon

b
Iron and Magnesium

c
Iron and Nickel

d
Magnesium and Silicon