Steam turbine and barrel: what they have in common

1. Step 1. Steam turbine — is part of — Geothermal power station. Steam from underground turns the turbines.
2. Step 2. Geothermal power station — is a kind of — Power station. A power station.
3. Step 3. Power station — is made of — Brick. The buildings of the first power stations were brick.
4. Step 4. Brick — is material for — Arch. Arches were built of brick or stone.
5. Step 5. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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