Diamond and barrel: what they have in common

1. Step 1. Diamond — is a kind of — Carbon. A form of carbon.
2. Step 2. Carbon — includes — Coal. Mostly carbon.
3. Step 3. Coal — is used in — Power station. The first stations ran on coal.
4. Step 4. Power station — is made of — Brick. The buildings of the first power stations were brick.
5. Step 5. Brick — is material for — Arch. Arches were built of brick or stone.
6. Step 6. 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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