Black absorber plate e railway track: o que têm em comum

1. Passo 1. Black absorber plate — faz parte de — Solar water heater. A black plate that absorbs light.
2. Passo 2. Solar water heater — tem como parte — Window glass. The glass on top creates a greenhouse effect.
3. Passo 3. Window glass — é feito de — Vidro float. Float glass.
4. Passo 4. Vidro float — utiliza — Tin. Glass spreads out over molten tin.
5. Passo 5. Tin — é material para — Model railway. The first models were tinplate.
6. Passo 6. Model railway — utiliza — Railway track. It runs on rails.

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