Insulating clay coating and greenhouse: what they have in common

1. Step 1. Insulating clay coating — is part of — Tandoor. An outer layer of clay with salt and wool.
2. Step 2. Tandoor — uses — Combustion. Fire heats the walls of the tandoor.
3. Step 3. Combustion — is used in — Smelting. Charcoal provides heat and reduces the metal from the ore.
4. Step 4. Smelting — is used in — Casting. Metal has to be melted for casting.
5. Step 5. Casting — is used in — Window glass. The panes were cast in moulds.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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