Steel well casing and aerosol can: what they have in common

1. Step 1. Steel well casing — is part of — Oil well. Steel pipes line the borehole.
2. Step 2. Oil well — is used in — Crude oil. Oil is extracted from wells.
3. Step 3. Crude oil — is material for — Petrol. Petrol is made from crude oil.
4. Step 4. Petrol — is used in — Carburettor. It mixes petrol with air.
5. Step 5. Carburettor — has part — Valve. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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