Cultivos transgénicos y barril: qué tienen en común

1. Paso 1. Cultivos transgénicos — utiliza — Fertilizante mineral. Intensive farming combines varieties and fertilizers.
2. Paso 2. Fertilizante mineral — utiliza — Ácido sulfúrico. Superphosphate is made with sulfuric acid.
3. Paso 3. Ácido sulfúrico — se utiliza en — Planta química. The first chemical plants produced sulfuric acid and soda.
4. Paso 4. Planta química — está hecho de — Ladrillo. The furnaces and towers are brick.
5. Paso 5. Ladrillo — es material para — Arco. Arches were built of brick or stone.
6. Paso 6. Arco — funciona como — Barril. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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