Macadam road and kiln: what they have in common

1. Step 1. Macadam road — is a kind of — Paved road. A road.
2. Step 2. Paved road — has part — Mortar. Roman roads had layers set in mortar.
3. Step 3. Mortar — is made of — Lime. Ancient mortars were lime-based.
4. Step 4. Lime — uses — Kiln. Lime is made by burning limestone.

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