railway lines, tracks for trains, steel bridge, bridge made of steel, docks, harbour loading areas, crash barriers, roadside safety rails, traffic lights, signals controlling traffic, road signs, signs giving road information, corrosion, gradual destruction of metal, rust, everyday name for iron oxide, iron oxide, compound formed when iron reacts, moist air, air containing water vapour, salt water, water that speeds up rusting, electrolyte, liquid that conducts electricity, carbon dioxide, gas that forms carbonic acid, carbonic acid, weak acid formed in water, anode, part where electrons leave, cathode, part where electrons arrive, acid rain, polluted rain that accelerates rust, sea water, salty water causing faster corrosion, road salt, winter salt that speeds rusting, sodium, salt element acting as accelerator.

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