Insulating clay coating and stone tool: 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 — is a kind of — Oven. An oven.
3. Step 3. Oven — is used in — Bread. Bread is baked in an oven.
4. Step 4. Bread — uses — Quern. Flour was ground on millstones.
5. Step 5. Quern — is a kind of — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.

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