Cast iron lamp post e oil well: o que têm em comum

1. Passo 1. Cast iron lamp post — faz parte de — Gas lamp. A cast-iron post.
2. Passo 2. Gas lamp — tem como parte — Valve. A gas supply valve.
3. Passo 3. Valve — faz parte de — Carburador. A throttle valve in the carburettor sets how much fuel-air mix reaches the engine.
4. Passo 4. Carburador — utiliza — Petrol. It mixes petrol with air.
5. Passo 5. Petrol — é feito de — Crude oil. Petrol is made from crude oil.
6. Passo 6. Crude oil — utiliza — Oil well. Oil is extracted from wells.

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