Catalytic converter and rolling mill: what they have in common

1. Step 1. Catalytic converter — uses — Catalysis. Platinum and palladium catalyse the oxidation of harmful gases.
2. Step 2. Catalysis — is used in — Chemical plant. Catalysts.
3. Step 3. Chemical plant — is made of — Brick. The furnaces and towers are brick.
4. Step 4. Brick — is material for — Open-hearth furnace. An open-hearth furnace is built of firebrick.
5. Step 5. Open-hearth furnace — is part of — Steel works. A steelmaking shop.
6. Step 6. Steel works — has part — Rolling mill. Rolling mills.

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