Carbon microphone and sewage treatment plant: what they have in common

1. Step 1. Carbon microphone — is made of — Carbon. Carbon granules.
2. Step 2. Carbon — includes — Activated carbon. Porous carbon.
3. Step 3. Activated carbon — is part of — Water filter. A charcoal filter.
4. Step 4. Water filter — uses — Gravity flow. Water seeps through by gravity.
5. Step 5. Gravity flow — is used in — Sewerage. Waste water flows down a gradient.
6. Step 6. Sewerage — has part — Sewage treatment plant. Treatment plants.

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