Underground water tunnel e turbine: o que têm em comum

1. Passo 1. Underground water tunnel — faz parte de — Qanat. A gently sloping tunnel through which water flows to the fields.
2. Passo 2. Qanat — utiliza — Gravity flow. Water flows by gravity.
3. Passo 3. Gravity flow — é utilizado em — Water wheel. Falling or flowing water turns the wheel.
4. Passo 4. Water wheel — evoluiu para — Turbine. The water turbine evolved from the water wheel.

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