Stone tool and kiln: what they have in common

1. Step 1. Stone tool — includes — Quern. A quern is two stones: the upper one is turned on the lower to grind grain.
2. Step 2. Quern — is used in — Bread. Flour was ground on millstones.
3. Step 3. Bread — uses — Oven. Bread is baked in an oven.
4. Step 4. Oven — works like — Kiln. A kiln and a baking oven work alike: fire heats a closed chamber.

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