Hot water storage tank and shaduf: what they have in common

1. Step 1. Hot water storage tank — is part of — Solar water heater. A store of hot water.
2. Step 2. Solar water heater — has part — Window glass. The glass on top creates a greenhouse effect.
3. Step 3. Window glass — is part of — Greenhouse. It lets light in and holds heat.
4. Step 4. Greenhouse — uses — Irrigation. Watering plants.
5. Step 5. Irrigation — uses — Shaduf. The shaduf fed water into the canals.

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