Railway switch e rocket: o que têm em comum

1. Passo 1. Railway switch — faz parte de — Railway track. Switches.
2. Passo 2. Railway track — é utilizado em — Metro. It runs on rails.
3. Passo 3. Metro — utiliza — Tunnel. Tunnels.
4. Passo 4. Tunnel — utiliza — Dinamite. Drilling and blasting.
5. Passo 5. Dinamite — evoluiu de — Gunpowder. A replacement for gunpowder in mining.
6. Passo 6. Gunpowder — é utilizado em — Rocket. The first rockets were powered by gunpowder.

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