Mother well shaft e rocket: o que têm em comum

1. Passo 1. Mother well shaft — faz parte de — Qanat. A vertical shaft down to the aquifer.
2. Passo 2. Qanat — é feito de — Argila. Weak sections of a qanat were reinforced with clay rings.
3. Passo 3. Argila — é material para — Grenade. Medieval grenades were ceramic vessels.
4. Passo 4. Grenade — utiliza — Gunpowder. An explosive.
5. Passo 5. Gunpowder — é utilizado em — Rocket. The first rockets were powered by gunpowder.

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