Why is aluminum widely used in aircraft structures?, It is very heavy, It has a good strength-to-weight ratio, It has poor corrosion resistance, It is difficult to form, How does aluminum naturally protect itself from corrosion?, By forming a protective oxide layer, By becoming magnetic, By absorbing water, By forming a layer of iron, Which properties make aluminum easy to shape and manufacture?, Hardness and brittleness, Magnetism and strength, Malleability and ductility, Density and weight

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