Roof tile and greenhouse: what they have in common

1. Step 1. Roof tile — uses — Kiln. Firing.
2. Step 2. Kiln — is used in — Brick. Fired brick is stronger than mud brick.
3. Step 3. Brick — is material for — Vault. And of brick.
4. Step 4. Vault — is part of — Gothic cathedral. Rib vaults.
5. Step 5. Gothic cathedral — has part — Window glass. Stained glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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