Wooden trough and oil well: what they have in common

1. Step 1. Wooden trough — is part of — Noria. It takes in water at the top and releases it into a channel.
2. Step 2. Noria — uses — Water wheel. The current itself turns the wheel.
3. Step 3. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
4. Step 4. Turbine — is part of — Ocean liner. Large liners run on steam turbines.
5. Step 5. Ocean liner — is made of — Wrought iron. The hull is iron, later steel.
6. Step 6. Wrought iron — is material for — Oil well. The casing pipes are iron.

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