Mother well shaft y cohete: qué tienen en común

1. Paso 1. Mother well shaft — forma parte de — Qanat. A vertical shaft down to the aquifer.
2. Paso 2. Qanat — está hecho de — Arcilla. Weak sections of a qanat were reinforced with clay rings.
3. Paso 3. Arcilla — es material para — Granada. Medieval grenades were ceramic vessels.
4. Paso 4. Granada — utiliza — Pólvora. An explosive.
5. Paso 5. Pólvora — se utiliza en — Cohete. The first rockets were powered by gunpowder.

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