Underground water tunnel und turbine: was sie gemeinsam haben

1. Schritt 1. Underground water tunnel — ist Teil von — Qanat. A gently sloping tunnel through which water flows to the fields.
2. Schritt 2. Qanat — nutzt — Gravity flow. Water flows by gravity.
3. Schritt 3. Gravity flow — wird verwendet in — Water wheel. Falling or flowing water turns the wheel.
4. Schritt 4. Water wheel — entwickelte sich zu — Turbine. The water turbine evolved from the water wheel.

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