Stone and sewage treatment plant: what they have in common

1. Step 1. Stone — is material for — Aqueduct. Aqueducts are stone arches and channels.
2. Step 2. Aqueduct — works like — Sewerage. Both systems carry water by gravity through channels: one drains waste, the other supplies water; the drains of Mohenjo-daro are older than the Roman aqueducts.
3. Step 3. Sewerage — has part — Sewage treatment plant. Treatment plants.

Open Evothings