Geothermal power station e knife: o que têm em comum

1. Passo 1. Geothermal power station — tem como parte — Steam turbine. Steam from underground turns the turbines.
2. Passo 2. Steam turbine — tem como parte — Caldeira. Steam from the boiler.
3. Passo 3. Caldeira — faz parte de — Steam hammer. A boiler supplies the steam.
4. Passo 4. Steam hammer — evoluiu de — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
5. Passo 5. Hammer — evoluiu de — Stone tool. The first hammer was a stone in the hand.
6. Passo 6. Stone tool — evoluiu para — Knife. The first knives were stone flakes.

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