Water treatment plant and petri dish: what they have in common

1. Step 1. Water treatment plant — is made of — Brick. Settling tanks are stone and brick.
2. Step 2. Brick — is material for — Sewerage. The drains of Mohenjo-daro are lined with fired brick.
3. Step 3. Sewerage — has part — Sewage treatment plant. Treatment plants.
4. Step 4. Sewage treatment plant — uses — Culture medium (agar). Waste water is cleaned by activated sludge — bacteria.
5. Step 5. Culture medium (agar) — uses — Petri dish. Agar in dishes.

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