Tuning fork stem and greenhouse: what they have in common

1. Step 1. Tuning fork stem — is part of — Tuning fork. A holder.
2. Step 2. Tuning fork — uses — Resonance. A natural frequency.
3. Step 3. Resonance — is used in — Bell. The sound.
4. Step 4. Bell — uses — Casting. Casting.
5. Step 5. Casting — is used in — Window glass. The panes were cast in moulds.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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