Chlorine and plough: what they have in common

1. Step 1. Chlorine — is used in — Water chlorination. Chlorine.
2. Step 2. Water chlorination — is used in — Water treatment plant. Chlorination.
3. Step 3. Water treatment plant — is made of — Brick. Settling tanks are stone and brick.
4. Step 4. Brick — uses — Trowel. Bricklaying with a trowel.
5. Step 5. Trowel — has part — Handle. A handle on a curved neck.
6. Step 6. Handle — is part of — Plough. Handles for steering the plough.

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