Water buckets on a wheel and plumbing: what they have in common

1. Step 1. Water buckets on a wheel — is part of — Noria. Pots on the rim lift the water.
2. Step 2. Noria — uses — Water wheel. The current itself turns the wheel.
3. Step 3. Water wheel — uses — Gravity flow. Falling or flowing water turns the wheel.
4. Step 4. Gravity flow — is used in — Aqueduct. Water flows down a gradient without pumps.
5. Step 5. Aqueduct — works like — Plumbing. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.

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