Wooden trough and bell: what they have in common

1. Step 1. Wooden trough — is part of — Noria. It takes in water at the top and releases it into a channel.
2. Step 2. Noria — is used in — Irrigation. Norias lifted water into canals.
3. Step 3. Irrigation — is used in — Greenhouse. Watering plants.
4. Step 4. Greenhouse — has part — Window glass. It lets light in and holds heat.
5. Step 5. Window glass — uses — Casting. The panes were cast in moulds.
6. Step 6. Casting — is used in — Bell. Casting.

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