Aeration tank with bubbling water and oil well: what they have in common

1. Step 1. Aeration tank with bubbling water — is part of — Sewage treatment plant. A tank where activated sludge breaks down pollutants.
2. Step 2. Sewage treatment plant — has part — Compressor. Blowers supply oxygen to the microbes.
3. Step 3. Compressor — is part of — Turbojet engine. The compressor compresses the air.
4. Step 4. Turbojet engine — uses — Kerosene. Jet fuel is kerosene.
5. Step 5. Kerosene — is made of — Crude oil. A fraction of crude oil.
6. Step 6. Crude oil — uses — Oil well. Oil is extracted from wells.

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