Pottery and chisel: what they have in common

1. Step 1. Pottery — uses — Kiln. Firing in a kiln makes clay strong.
2. Step 2. Kiln — is used in — Brick. Fired brick is stronger than mud brick.
3. Step 3. Brick — is material for — Metro. The vaults of the first tunnels are brick.
4. Step 4. Metro — uses — Tunnel. Tunnels.
5. Step 5. Tunnel — uses — Chisel. Hezekiah’s Tunnel was cut by hand with chisels.

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