Which kind of screw resists rusting?

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Multiple Choice

Which kind of screw resists rusting?

Explanation:
Rust is iron oxide, so a screw that resists rusting must avoid iron. Brass, an alloy of copper and zinc, doesn’t contain iron and naturally resists rust. It also forms a protective surface layer that protects against corrosion in many moisture-filled environments. The other descriptors don’t address material composition: a Phillips describes the head shape, fine thread describes the thread pitch, and steel contains iron and will rust when exposed to moisture.

Rust is iron oxide, so a screw that resists rusting must avoid iron. Brass, an alloy of copper and zinc, doesn’t contain iron and naturally resists rust. It also forms a protective surface layer that protects against corrosion in many moisture-filled environments. The other descriptors don’t address material composition: a Phillips describes the head shape, fine thread describes the thread pitch, and steel contains iron and will rust when exposed to moisture.

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