J-2 rocket engine and greenhouse: what they have in common

1. Step 1. J-2 rocket engine — is part of — Saturn V. Hydrogen engines on the upper stages.
2. Step 2. Saturn V — uses — Hydrogen. Hydrogen stages.
3. Step 3. Hydrogen — is material for — Ammonia. Hydrogen.
4. Step 4. Ammonia — is material for — Mineral fertilizer. Nitrogen fertilizers.
5. Step 5. Mineral fertilizer — is used in — Hydroponics. A nutrient solution.
6. Step 6. Hydroponics — uses — Greenhouse. Usually in greenhouses.

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